Fix Collapsing of Delete-Create mounting instructions

Summary:
This diff fixes the Collapsing of Delete-Create mounting instructions algorithm. By mistake I switch the conditions before landing the original diff.

Changelog: [Internal]

Reviewed By: JoshuaGross

Differential Revision: D18306616

fbshipit-source-id: 50cd8ca67adcaf172ce51896df684fed270b2d51

Author: mdvacca

ReactAndroid/src/main/java/com/facebook/react/fabric/jni/Binding.cpp

@@ -581,9 +581,9 @@ void Binding::schedulerDidFinishTransaction(
       } else if (mutation.type == ShadowViewMutation::Create) {
         int tag = mutation.oldChildShadowView.tag;
         if (createAndDeleteTagsToProcess.find(tag) != createAndDeleteTagsToProcess.end()) {
-          createAndDeleteTagsToProcess.erase(tag);
-        } else {
           createAndDeleteTagsToProcess.insert(tag);
+        } else {
+          createAndDeleteTagsToProcess.erase(tag);
         }
       }
     }