Revert "[native] Move CommSecureStore::get to main thread to avoid JNI crash"
Summary: This reverts commit 980305ee4c956ab22e1577a0d1d810c269e0d80b.
Test Plan: Build Android app and ensure the crash fixed by counterpart diff reoccurs
Reviewers: ashoat, atul
Reviewed By: ashoat
Subscribers: tomek
Differential Revision: https://phab.comm.dev/D6980