DO NOT MERGE: Change the order of 2 statements to remove race.

When we finish action mode we access to the cursor of model in main
thread to remove selection. When we transfer documents we have a
GetDocumentsTask that access the cursor in background. This creates a
race condition that contaminates the final copy result.

Temporary solution is to finish action mode first and then transfer
documents so that when GetDocumentsTask is running action mode is
already finished.

Permanent solution is provided as part of ag/1138398 which removes
GetDocumentsTask.

Bug: 30082168
Change-Id: I5bffe2093a58c856044026913d038f80a3fd7d55