Fix regression in highlighting quicksearch results

escapeHTML() is needed, since the data to search is necessarily already
HTML encoded (or else it would be impossible to add the SPAN tags).

This broke searches for things like, for example, '<foo>'.

imp/js/dimpbase.js

@@ -552,7 +552,7 @@ var DimpBase = {
 
                         if (highlight && this.isQSearch()) {
                             r[h] = r[h].gsub(
-                                new RegExp("(" + RegExp.escape($F('horde-search-input')) + ")", "i"),
+                                new RegExp("(" + RegExp.escape($F('horde-search-input').escapeHTML()) + ")", "i"),
                                 '<span class="qsearchMatch">#{1}</span>'
                             );
                         }