Avoid self capture in blocks that would extend RCTDevSettings instance lifetime.
Avoid self capture in blocks that would extend RCTDevSettings instance lifetime.

Summary:
Avoid self capture in blocks that would extend RCTDevSettings instance lifetime.

Changelog:
[iOS][Fixed] - Use weakSelf in objc block instead of self.

Reviewed By: RSNara

Differential Revision: D33594868

fbshipit-source-id: 2dce135ae88337a09fb2f3e9462e10a4692bc7a7

javache/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,facebook/react-native,javache/react-native,javache/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,facebook/react-native,javache/react-native,javache/react-native,janicduplessis/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native