Eliminate a redundant mapping for -typo-correction-limit.

Author: DougGregor

Sources/SwiftDriver/Jobs/FrontendJobHelpers.swift

@@ -95,7 +95,6 @@ extension Driver {
     try commandLine.appendLast(.warnSwift3ObjcInferenceMinimal, .warnSwift3ObjcInferenceComplete, from: &parsedOptions)
     try commandLine.appendLast(.warnImplicitOverrides, from: &parsedOptions)
     try commandLine.appendLast(.typoCorrectionLimit, from: &parsedOptions)
-    try commandLine.appendLast(.typoCorrectionLimit, from: &parsedOptions)
     try commandLine.appendLast(.enableAppExtension, from: &parsedOptions)
     try commandLine.appendLast(.enableLibraryEvolution, from: &parsedOptions)
     try commandLine.appendLast(.enableTesting, from: &parsedOptions)