fix 无法映射到 dubbo.registries

[brucelwl]

fix 多注册中心时, 无法映射到 dubbo.registries.xxx

[codecov-io]

Codecov Report

Merging #656 into master will increase coverage by 0.15%.
The diff coverage is 66.66%.

@@             Coverage Diff             @@
##             master    #656      +/-   ##
===========================================
+ Coverage     78.95%   79.1%   +0.15%     
- Complexity      212     213       +1     
===========================================
  Files            40      40              
  Lines           651     651              
  Branches         66      66              
===========================================
+ Hits            514     515       +1     
+ Misses          107     106       -1     
  Partials         30      30

Impacted Files	Coverage Δ	Complexity Δ
...ot/autoconfigure/DubboConfigurationProperties.java	50.54% <66.66%> (+1.09%)	16 <1> (+1)	⬆️

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