[ISSUE #7813] setStartDetectorEnable Not effective

[leizhiyuan]

Which Issue(s) This PR Fixes

Fixes #7813

Brief Description

由于StartDetectorEnable 在构造函数里面只初始化了一次，所以后续再set的时候， 已经不会生效了。

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (8df53df) 42.94% compared to head (f805f0d) 42.99%.
Report is 11 commits behind head on develop.

Files	Patch %	Lines
...he/rocketmq/client/producer/DefaultMQProducer.java	0.00%	3 Missing ⚠️
...ache/rocketmq/store/config/MessageStoreConfig.java	50.00%	2 Missing ⚠️
...mq/client/impl/producer/DefaultMQProducerImpl.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #7825      +/-   ##
=============================================
+ Coverage      42.94%   42.99%   +0.04%     
- Complexity      9902     9921      +19     
=============================================
  Files           1190     1190              
  Lines          85930    85982      +52     
  Branches       11070    11078       +8     
=============================================
+ Hits           36906    36964      +58     
+ Misses         44458    44439      -19     
- Partials        4566     4579      +13     

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