Display pricing tier even when a domain is reserved

Even though it's not directly related, I also fixed a typo in PREMIUM because it bugged me.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=237796791

java/google/registry/monitoring/whitebox/CheckApiMetric.java

@@ -28,7 +28,7 @@ public abstract class CheckApiMetric {
   /** Price tier of a domain name. */
   public enum Tier {
     STANDARD("standard"),
-    PREMINUM("premium");
+    PREMIUM("premium");
 
     private final String displayLabel;