Fix coloring bug when variable name following space and opening parenthesis #4

Author: hudochenkov

Syntaxes/PostCSS.tmLanguage

@@ -137,7 +137,7 @@
 		</dict>
 		<dict>
 			<key>include</key>
-			<string>#variable-root</string>
+			<string>#variable</string>
 		</dict>
 		<dict>
 			<key>include</key>
@@ -655,13 +655,6 @@
 			<key>name</key>
 			<string>keyword.other.unit.css.postcss</string>
 		</dict>
-		<key>variable-root</key>
-		<dict>
-			<key>match</key>
-			<string>\$[\w-]+</string>
-			<key>name</key>
-			<string>variable.other.root</string>
-		</dict>
 		<key>variable</key>
 		<dict>
 			<key>match</key>