Fix CommandType argument highlighting

Function, Filter, Configuration and Workflow keywords are highlighted when used as arguments for CommandType parameter.

Author: kborowinski

PowerShellSyntax.tmLanguage

@@ -542,7 +542,7 @@
 		<key>function</key>
 		<dict>
 			<key>begin</key>
-			<string>(?&lt;!\S)(?i)(function|filter|configuration|workflow)\s+(?:(global|local|script|private):)?((?:\p{L}|\d|_|-|\.)+)</string>
+			<string>^(?:\s*+)(?i)(function|filter|configuration|workflow)\s+(?:(global|local|script|private):)?((?:\p{L}|\d|_|-|\.)+)</string>
 			<key>beginCaptures</key>
 			<dict>
 				<key>0</key>