Remove descriptor

…as descriptors are only partially included and could be confusing

src/vs/languages/css/common/buildscripts/css-schema.xml

@@ -16757,7 +16757,6 @@
         <value name="text" version="3.0" browsers="all" />
       </values>
     </entry>
-    <entry name="user-zoom" restriction="" version="" browsers="all" />
     <entry name="vertical-align" restriction="percentage, length" version="1.0" browsers="all" ref="http://www.w3.org/TR/css3-linebox/#vertical-align" syntax="div { $(name): middle; }">
       <desc>Affects the vertical positioning of the inline boxes generated by an inline-level element inside a line box.</desc>
       <values>