Always write the manifest in multiRemove (#18613)

Summary:
RCTAsyncLocalStorage did not write the manifest after removing a value that was larger than RCTInlineValueThreshold. This meant that the values would still be on disk as null in the manifest.json, and if the app didn't do anything to make the manifest get written out again the null values would persist in the AsyncStorage and be returned by getAllKeys. We need to always write out the manifest.json even if the value is in the overflow storage files.

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Fixes #9196.

Not sure where the tests are for this?

none.

[IOS] [BUGFIX] [AsyncStorage] - Correctly remove keys of large values from AsyncStorage.

tadeuzagallo nicklockwood dannycochran
Pull Request resolved: #18613

Differential Revision: D13860820

Pulled By: cpojer

fbshipit-source-id: ced1cd40273140335cd9b1f29fc1c1881ab8cebd

Author: esprehn

React/Modules/RCTAsyncLocalStorage.m

@@ -423,10 +423,8 @@ - (NSDictionary *)_writeEntry:(NSArray<NSString *> *)entry changedManifest:(BOOL
         NSString *filePath = [self _filePathForKey:key];
         [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
         [RCTGetCache() removeObjectForKey:key];
-        // remove the key from manifest, but no need to mark as changed just for
-        // this, as the cost of checking again next time is negligible.
-        [_manifest removeObjectForKey:key];
-      } else if (_manifest[key]) {
+      }
+      if (_manifest[key]) {
         changedManifest = YES;
         [_manifest removeObjectForKey:key];
       }