[native] Unblock scrolling when continuing editing

Summary: After the user decides to continue editing if tried to open the modal, he wasn't able to scroll anymore. This diff addresses that, by unlocking scrolling after closing the alert.

Test Plan:

• Enter edit mode and make changes to the message,
• Try to open the tooltip modal
• Press continue editing
• Check if the user still can scroll the messages list

Reviewers: michal, inka, ashoat, tomek

Reviewed By: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8271