Removed unnecessary super interface

See: https://github.com/cryptomator/cryptomator/pull/1691#discussion_r650770011

Also fixes: https://github.com/cryptomator/cryptomator/pull/1691#discussion_r650769229

src/main/java/org/cryptomator/common/settings/AbstractInvalidSetting.java

@@ -1,23 +0,0 @@
-package org.cryptomator.common.settings;
-
-import java.net.URI;
-
-public interface AbstractInvalidSetting {
-
-	/**
-	 * Returns the corresponding issue URI of this setting.<br>
-	 * The issue URI usually resolves to a page on the
-	 * <a href="https://github.com/cryptomator/cryptomator/issues">Cryptomator Bugtracker.</a>
-	 *
-	 * @return the issue URI or {@code null} if none is provided.
-	 */
-	URI getIssueURI();
-
-	/**
-	 * Returns a (preferably localized) message, that helps the user understand the
-	 * issue in their configuration and how to fix it.
-	 *
-	 * @return the non-null description of the issue.
-	 */
-	String getMessage();
-}

src/main/java/org/cryptomator/common/settings/InvalidSetting.java

@@ -4,7 +4,7 @@ import java.net.URI;
 import java.util.Objects;
 import java.util.ResourceBundle;
 
-public enum InvalidSetting implements AbstractInvalidSetting {
+public enum InvalidSetting {
 
 	;
 
@@ -24,12 +24,23 @@ public enum InvalidSetting implements AbstractInvalidSetting {
 		this(onDefaultTracker(issueId), Objects.requireNonNull(resourceKey));
 	}
 
-	@Override
+	/**
+	 * Returns the corresponding issue URI of this setting.<br>
+	 * The issue URI usually resolves to a page on the
+	 * <a href="https://github.com/cryptomator/cryptomator/issues">Cryptomator Bugtracker.</a>
+	 *
+	 * @return the issue URI or {@code null} if none is provided.
+	 */
 	public URI getIssueURI() {
 		return this.issue;
 	}
 
-	@Override
+	/**
+	 * Returns a (preferably localized) message, that helps the user understand the
+	 * issue in their configuration and how to fix it.
+	 *
+	 * @return the non-null description of the issue.
+	 */
 	public String getMessage() {
 		if (!BUNDLE.containsKey(this.resourceKey)) {
 			return UNKNOWN_KEY_FORMAT.formatted(this.resourceKey);

src/main/java/org/cryptomator/common/settings/InvalidSettingException.java

@@ -3,28 +3,28 @@ package org.cryptomator.common.settings;
 
 public class InvalidSettingException extends RuntimeException {
 
-	private final AbstractInvalidSetting reason;
+	private final InvalidSetting reason;
 	private final String additionalMessage;
 
-	public InvalidSettingException(AbstractInvalidSetting reason) {
+	public InvalidSettingException(InvalidSetting reason) {
 		this(reason, null, null);
 	}
 
-	public InvalidSettingException(AbstractInvalidSetting reason, String additionalMessage) {
+	public InvalidSettingException(InvalidSetting reason, String additionalMessage) {
 		this(reason, additionalMessage, null);
 	}
 
-	public InvalidSettingException(AbstractInvalidSetting reason, Throwable cause) {
+	public InvalidSettingException(InvalidSetting reason, Throwable cause) {
 		this(reason, null, cause);
 	}
 
-	public InvalidSettingException(AbstractInvalidSetting reason, String additionalMessage, Throwable cause) {
+	public InvalidSettingException(InvalidSetting reason, String additionalMessage, Throwable cause) {
 		super(composeMessage(reason, additionalMessage), cause);
 		this.reason = reason;
 		this.additionalMessage = additionalMessage;
 	}
 
-	public AbstractInvalidSetting getReason() {
+	public InvalidSetting getReason() {
 		return this.reason;
 	}
 
@@ -32,7 +32,7 @@ public class InvalidSettingException extends RuntimeException {
 		return this.additionalMessage;
 	}
 
-	private static String composeMessage(AbstractInvalidSetting reason, String additionalMessage) {
+	private static String composeMessage(InvalidSetting reason, String additionalMessage) {
 		if (additionalMessage == null) {
 			return reason.getMessage();
 		}