fix: fix bug of MySQL.Status.DBCount

[nakamasato]

Close #197

Update Status.DBCount when referencedDBNum is different from Status.DBCount

[codecov]

Codecov Report

Merging #202 (0672c7f) into main (e22ddd0) will decrease coverage by 1.94%.
The diff coverage is 57.53%.

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   65.29%   63.36%   -1.94%     
==========================================
  Files           6        6              
  Lines         559      595      +36     
==========================================
+ Hits          365      377      +12     
- Misses        150      168      +18     
- Partials       44       50       +6     

Impacted Files	Coverage Δ
controllers/mysqluser_controller.go	66.83% <0.00%> (-7.40%)	⬇️
controllers/mysql_controller.go	52.86% <50.00%> (-2.11%)	⬇️
controllers/test_utils.go	74.00% <66.66%> (+0.82%)	⬆️
controllers/mysqldb_controller.go	47.36% <100.00%> (+4.70%)	⬆️

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