Remove unnecessary explicit generic type declarations

They can be inferred correctly even in Java 7, and display as
compiler warnings in IntelliJ.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=173451087

java/google/registry/rde/RdeStagingAction.java

@@ -237,7 +237,7 @@ public final class RdeStagingAction implements Runnable {
             reducer,
             ImmutableList.of(
                 // Add an extra shard that maps over a null resource. See the mapper code for why.
-                new NullInput<EppResource>(),
+                new NullInput<>(),
                 EppResourceInputs.createEntityInput(EppResource.class)))));
   }