fix(risedev): fix task panic error msg

[xxchan]

before

thread 'main' panicked at src/risedevtool/src/bin/risedev-dev.rs:399:63:
Failed to join thread, likely panicked: Any { .. }
Error while executing command, exit code: 101

after

ERROR - Failed to start: failed to join thread, likely panicked: more than one or no pg store config found for metastore: ExactlyOneError { inner: Filter { iter: Iter([]) } }

Signed-off-by: xxchan [email protected]

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