Fixing visibility in the Storage configuration

[msmakouz]

Q	A
Bugfix?	✔️
Breaks BC?	❌
New feature?	❌

What was changed

1. Fixed a typo in the Storage configuration file, added tests for it.
2. Updated Rector.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.14% 🎉

Comparison is base (8aeef4c) 83.74% compared to head (8078820) 83.88%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #977      +/-   ##
============================================
+ Coverage     83.74%   83.88%   +0.14%     
  Complexity     6042     6042              
============================================
  Files           793      793              
  Lines         17023    17023              
============================================
+ Hits          14256    14280      +24     
+ Misses         2767     2743      -24     

Files Changed	Coverage Δ
src/Storage/src/Bucket/WritableTrait.php	0.00% <ø> (ø)
src/Tokenizer/src/Reflection/ReflectionFile.php	95.16% <ø> (ø)
src/Translator/src/Traits/TranslatorTrait.php	100.00% <ø> (ø)
src/Storage/src/Config/StorageConfig.php	54.28% <100.00%> (+17.85%)	⬆️

... and 1 file with indirect coverage changes

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