🐛 change codemod name to better match the codemod

I put the correct Sonar identifier in the name but forgot
to change the human readable bit to match

core-codemods/src/main/java/io/codemodder/codemods/RemoveUnusedImportCodemod.java

@@ -18,7 +18,7 @@
 import javax.inject.Inject;
 
 @Codemod(
-    id = "sonar:java/remove-redundant-variable-creation-s1128",
+    id = "sonar:java/remove-unused-import-s1128",
     reviewGuidance = ReviewGuidance.MERGE_WITHOUT_REVIEW,
     importance = Importance.LOW,
     executionPriority = CodemodExecutionPriority.HIGH)