Fix false positive in redundant_set_access_control

[marcelofabri]

Fixes #2182

Not adding a changelog entry because this rule hasn't been officially released it

[SwiftLintBot]

	2 Warnings
⚠️	Please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.
⚠️	This PR may need tests.

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Here's an example of your CHANGELOG entry:

* Fix false positive in redundant_set_access_control.  
  [marcelofabri](https://github.com/marcelofabri)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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[codecov-io]

Codecov Report

Merging #2183 into master will increase coverage by <.01%.
The diff coverage is 92.3%.

@@            Coverage Diff             @@
##           master    #2183      +/-   ##
==========================================
+ Coverage      92%   92.01%   +<.01%     
==========================================
  Files         276      276              
  Lines       13830    13843      +13     
==========================================
+ Hits        12724    12737      +13     
  Misses       1106     1106

Impacted Files	Coverage Δ
...ramework/Rules/RedundantSetAccessControlRule.swift	96.66% <92.3%> (-3.34%)	⬇️
Source/SwiftLintFramework/Models/Command.swift	98.7% <0%> (+1.29%)	⬆️

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[jpsim]

Is there a way to keep the violation on fileprivate/fileprivate?

[marcelofabri]

@jpsim I think I've found a way! Let's see if osscheck finds anything interesting.

[jpsim]

Smart! Well done! 👏