Fix disabling superfluous_disable_command rule

[marcelofabri]

Fixes #1890

// cc @bdorfman-stripe

[SwiftLintBot]

	12 Messages
📖	Linting Aerial with this PR took 0.42s vs 0.38s on master (10% slower)
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📖	Linting Firefox with this PR took 11.87s vs 11.11s on master (6% slower)
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📖	Linting Nimble with this PR took 1.65s vs 1.61s on master (2% slower)
📖	Linting Quick with this PR took 0.49s vs 0.5s on master (2% faster)
📖	Linting Realm with this PR took 2.78s vs 2.74s on master (1% slower)
📖	Linting SourceKitten with this PR took 0.95s vs 0.94s on master (1% slower)
📖	Linting Sourcery with this PR took 4.0s vs 4.07s on master (1% faster)
📖	Linting Swift with this PR took 11.67s vs 11.92s on master (2% faster)
📖	Linting WordPress with this PR took 10.7s vs 10.82s on master (1% faster)

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[codecov-io]

Codecov Report

Merging #1891 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1891      +/-   ##
==========================================
+ Coverage   88.75%   88.76%   +0.01%     
==========================================
  Files         238      238              
  Lines       11710    11723      +13     
==========================================
+ Hits        10393    10406      +13     
  Misses       1317     1317

Impacted Files	Coverage Δ
Source/SwiftLintFramework/Models/Linter.swift	81.81% <100%> (+1.01%)	⬆️
Tests/SwiftLintFrameworkTests/CommandTests.swift	98.55% <100%> (+0.04%)	⬆️

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[jpsim]

At some point it might be nice to refactor the rule to be a real rule, conforming to the Rule protocol, which would hopefully avoid special casing it. But for now, this is ok. 👍