[SB] Remove flag status_bar_auto_start_screen_record_chip

Flag launched awhile ago, so we can remove it.

Fixes: 409611072
Bug: 366448907
Flag: EXEMPT flag removal

Test: atest ScreenRecordChipInteractorTest
Test: verify screen record chip still works
Change-Id: Ib06c83a0f9bd4300eef8f7089e45a1af1b1d15d9