[fix] fix the reset button in the oscar theme (#2306)

Rely on javascript instead of type="clear"

Close #2009

searx/static/themes/oscar/js/searx_src/element_modifiers.js

@@ -21,6 +21,13 @@ $(document).ready(function(){
      */
     $('#q.autofocus').focus();
 
+    /**
+     * Empty search bar when click on reset button
+     */
+    $("#clear_search").click(function () {
+	document.getElementById("q").value = "";
+    });
+
     /**
      * select full content on click if class="select-all-on-click"
      */