fix: align _generic.help.html from responsive template to devel

Update responsive template as it's _generic.help.html was identical
except for a 'class=table' vs 'class=classhelp'. AFAICT, '.table'
never appears in the css, so the class has no effect.

This makes applying changes easier since I have a couple of identical
files.

Author: rouilj

share/roundup/templates/responsive/html/_generic.help.html

@@ -2,7 +2,7 @@
 <tal:block metal:fill-slot="content">
 <tal:block tal:condition="python:'property' in request.form">
  <form name="frm_help" action="#">
-     <table class="table"
+     <table class="classhelp"
             tal:define="props python:request.form['properties'].value.split(',');
                         legend templates/help/macros/legend;
                         navigation templates/help/macros/batch_navi;