Fixing a [func]Y regex bug

All the `Y` options where not properly ORing, now they are.

Author: amadeus

syntax/css.vim

@@ -165,7 +165,7 @@ syn region cssURL contained matchgroup=cssFunctionName start="\<url\s*(" end=")"
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(rgb\|clip\|attr\|counter\|rect\|cubic-bezier\)\s*(" end=")" oneline keepend
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(rgba\|hsl\|hsla\)\s*(" end=")" oneline keepend
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(linear\|radial\)-gradient\s*(" end=")" oneline keepend
-syn region cssFunction contained matchgroup=cssFunctionName start="\<\(matrix\(3d\)\=\|scale\(3d\|X\|Y|\Z\)\=\|translate\(3d\|X\|Y|\Z\)\=\|skew\(X\|Y\)\=\|rotate\(3d\|X\|Y|\Z\)\=\|perspective\)\s*(" end=")" oneline keepend
+syn region cssFunction contained matchgroup=cssFunctionName start="\<\(matrix\(3d\)\=\|scale\(3d\|X\|Y\|Z\)\=\|translate\(3d\|X\|Y\|Z\)\=\|skew\(X\|Y\)\=\|rotate\(3d\|X\|Y\|Z\)\=\|perspective\)\s*(" end=")" oneline keepend
 
 " Prop and Attr
 syn keyword cssCommonAttr contained auto none inherit all default normal