Fix fishhook import

[dgyesbreghs]

Motivation

We were getting a 'file not found' error, when we tried to integrate React Native through CocoaPods.
Screenshot
Removing the first part of the import has fixed the import statement. Let Xcode found the correct location/file.

Test Plan

1. Clone the following repository.
2. Run npm install
3. Try to compile the iOS project.
4. You're getting a file not found error.
5. Modify the import statement in the RCTReconnectingWebSocket.m file.
6. Try to compile the iOS project.
7. If everything goes well, you're getting a Build Successful message.

Or you can watch the video below.
Video

Release Notes

[IOS][BUGFIX] - Make sure you can use React Native through CocoaPods

[pull-bot]

	Warnings
⚠️	📋 Release Notes - This PR may have incorrectly formatted Release Notes.

@facebook-github-bot label Needs more information

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[chirag04]

@facebook-github-bot duplicate #16271

[facebook-github-bot]

@dgyesbreghs I tried to find reviewers for this pull request and wanted to ping them to take another look. However, based on the blame information for the files in this pull request I couldn't find any reviewers. This sometimes happens when the files in the pull request are new or don't exist on master anymore. Is this pull request still relevant? If yes could you please rebase? In case you know who has context on this code feel free to mention them in a comment (one person is fine). Thanks for reading and hope you will continue contributing to the project.

[msand]

This should probably be solved using this approach: #13198 (comment)

[chirag04]

closing as a duplicate of #16271