Fix typo in copypasting...

Signed-off-by: Danilo Aimini <82231674+AMZN-daimini@users.noreply.github.com>

Code/Framework/AzCore/AzCore/UnitTest/Mocks/MockSettingsRegistry.h

@@ -27,8 +27,8 @@ namespace AZ
         MOCK_METHOD1(RegisterNotifier, NotifyEventHandler(NotifyCallback&&));
         MOCK_METHOD1(RegisterPreMergeEvent, PreMergeEventHandler(const PreMergeEventCallback&));
         MOCK_METHOD1(RegisterPreMergeEvent, PreMergeEventHandler(PreMergeEventCallback&&));
-        MOCK_METHOD1(PostMergeEventHandler, PreMergeEventHandler(const PostMergeEventCallback&));
-        MOCK_METHOD1(PostMergeEventHandler, PreMergeEventHandler(PostMergeEventCallback&&));
+        MOCK_METHOD1(RegisterPostMergeEvent, PostMergeEventHandler(const PostMergeEventCallback&));
+        MOCK_METHOD1(RegisterPostMergeEvent, PostMergeEventHandler(PostMergeEventCallback&&));
 
         MOCK_CONST_METHOD2(Get, bool(bool&, AZStd::string_view));
         MOCK_CONST_METHOD2(Get, bool(s64&, AZStd::string_view));