Remove redundant test of vertical_whitespace
Remove redundant test of vertical_whitespace

As it is now in `VerticalWhitespaceRuleTests`. Per code review from
@marcelofabri

victorpimentel/SwiftLint,realm/SwiftLint,Johnykutty/SwiftLint,firebase/SwiftLint,realm/SwiftLint,firebase/SwiftLint,Johnykutty/SwiftLint,jeffreybergier/SwiftLint,firebase/SwiftLint,Johnykutty/SwiftLint,lyft/SwiftLint,jeffreybergier/SwiftLint,lyft/SwiftLint,jeffreybergier/SwiftLint,victorpimentel/SwiftLint,lyft/SwiftLint,Johnykutty/SwiftLint,victorpimentel/SwiftLint,lyft/SwiftLint,jeffreybergier/SwiftLint,realm/SwiftLint,firebase/SwiftLint,realm/SwiftLint,victorpimentel/SwiftLint