vim: remoe unnecessary keyword option

skipwhite does not do anything for keyword matches.  Remove the unnecessary
option.  NFC.

Author: compnerd

utils/vim/syntax/swift.vim

@@ -12,8 +12,8 @@ syn keyword swiftImport import skipwhite nextgroup=swiftImportModule
 syn match swiftImportModule /\<[A-Za-z_][A-Za-z_0-9]*\>/ contained nextgroup=swiftImportComponent
 syn match swiftImportComponent /\.\<[A-Za-z_][A-Za-z_0-9]*\>/ contained nextgroup=swiftImportComponent
 
-syn keyword swiftKeyword break case continue default do else for guard if in static switch repeat return where while public internal private mutating nonmutating var let typealias protocol extension skipwhite
-syn keyword swiftKeyword associatedtype override required convenience final defer skipwhite
+syn keyword swiftKeyword break case continue default do else for guard if in static switch repeat return where while public internal private mutating nonmutating var let typealias protocol extension
+syn keyword swiftKeyword associatedtype override required convenience final defer
 
 syn keyword swiftTypeDefinition class extension protocol struct typealias enum skipwhite nextgroup=swiftTypeName
 syn region swiftTypeAttributes start="\[" end="\]" skipwhite contained nextgroup=swiftTypeName