Clean up aconfig flag bugreport_mode_max_value

Flag bugreport_mode_max_value has been advanced to next since March 2024 and published in 24Q3 release. No regression was observed. Clean the flag up for now to keep code healthy.

Bug: 305067125
Test: atest BugreportManagerTest
Flag: EXEMPT flag clean up
Change-Id: I1c3b24c8f4bd300fb78ab6bc858a14df9bd1bec3
3 files changed