[native] Pass on nativeSetUserAvatar's Promise to actionSheetConfig
Summary:
actionSheetConfig can take a => mixed function here, so we can pass the Promise directly to avoid triggering unused-promise Flow lint.
Dependds on D10166
Test Plan: Flow
Reviewers: atul, ginsu
Reviewed By: ginsu
Subscribers: tomek
Differential Revision: https://phab.comm.dev/D10167