AppOps SQLite minor fixes

Fix initial cache size to avoid array copy
during size increases.

Closing the database on caller thread can
interrrupt ongoing write transaction in
io thread.

Test: presubmit
Bug: 377584611
Flag: android.permission.flags.enable_all_sqlite_appops_accesses
Change-Id: I2787761811c295ba96e5527f685575d9ad5b2c86