Revert search input type as it show 2 magnifiers on safari.

Co-authored-by: Mike Rogers <me@mikerogers.io>

lib/rdoc/generator/template/rails/_panel.rhtml

@@ -2,7 +2,7 @@
 <label class="panel_mobile_button" for="hamburger"><span></span> Menu</label>
 <div class="panel panel_tree" id="panel" data-turbolinks-permanent>
   <div class="header">
-    <input type="search" placeholder="Search for a class, method, ..." autosave="searchdoc" results="10" id="search" autocomplete="off" tabindex="-1" />
+    <input type="text" placeholder="Search for a class, method, ..." autosave="searchdoc" results="10" id="search" autocomplete="off" tabindex="-1" />
     <label class="panel_mobile_button_close" for="hamburger"><span></span> Close</label>
   </div>
   <div class="tree">