Fix adb shell cmd config remove command when no (uid, id) pair is

specified.

- Previous logic was omitting commands when only 'adb shell cmd config
remove' was provided without any uid, id argument. This change fixes it.
- Recent disk guardrail change flips the convention of file name in
statsd directories to begin with timestamps. So delete with prefix was
changed to delete with suffix.

Bug: 72265185
Test: manual testing, statsd_test
Change-Id: Ia727fbc7acf0d9268b9f4952fa59975f4a9134cb