tests: Remove sms.db{-wal,-shm} files, not just sms.db

ERROR: files left in build directory after distclean:
./sms.db-shm
./tests/sms.db-shm
./tests/sms.db-wal
./sms.db-wal

Change-Id: Iecd380f598edbd1635361e4c340d54d092739919
1 file changed