[native] use savedEmojiAvatarSelectorForCurrentUser in EmojiAvatarCreation

Summary:
Based on feedback I got in D7359, when we "reset" the emoji avatar during the emoji avatar creation flow , we want to reset to the current state in redux which we are considering the source of truth. This is the diff that implements the selector I introduced in the previous diff

Depends on D7402

Test Plan:
The reset functionality behaves as expected:

Reviewers: ashoat, atul

Reviewed By: ashoat

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7403