fix: fix when scale replicant pod to 0, core pod can not ready

[codecov[bot]]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (dd376af) 77.27% compared to head (0b33232) 76.94%.

Files	Patch %	Lines
controllers/apps/v2beta1/update_emqx_status.go	87.50%	3 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1003 +/- ## ========================================== - Coverage 77.27% 76.94% -0.34% ========================================== Files 67 67 Lines 6129 6141 +12 ========================================== - Hits 4736 4725 -11 - Misses 1169 1192 +23 Partials 224 224 ```

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