refactor(docs): remove extraneous var

Author: ajoslin

docs/app/js/highlight-angular.js

@@ -46,8 +46,7 @@ DocsApp
           });
 
           // Make it so each line starts at 0 whitespace
-          var match = lines[0].match(/^\s*/);
-          var firstLineWhitespace =  match && match[0] || ''; 
+          var firstLineWhitespace = lines[0].match(/^\s*/)[0];
           var startingWhitespaceRegex = new RegExp('^' + firstLineWhitespace);
           lines = lines.map(function(line) {
             return line