remove unused getAll with arity 2 from RCT_EXPORT_METHOD

[kafaichoi]

Hello. Currently if I try to call CookieManager.getAll() it will throw exception complaining the arity difference between native and js code. I am not too familiar with object-c and react bridge code but I belive the function I remove from this PR is not needed anymore and it solve the exception when calling getAll. Please let me know if there is any problem so I can further imrpove it.

[safaiyeh]

I have forked the repo here: https://github.com/safaiyeh/react-native-cookie-store We can create issues and PRs there to continue the development of the project.