hgweb: remove unneeded escaping in gitweb/map and monoblue/map

Elements in map files work slightly different from regular python strings, so
escaping single quotes is not necessary. It is also demonstrated by the very
same lines: '(current diff)'.

I should've made this in 9e1f4c65f5f5, but here we go.

mercurial/templates/gitweb/map

@@ -140,7 +140,7 b" changesetparentdiff = '"
   <tr>
     <td>parent {rev}</td>
     <td style="font-family:monospace">
-      {changesetlink} {ifeq(node, basenode, '(current diff)', \'({difffrom})\')}
+      {changesetlink} {ifeq(node, basenode, '(current diff)', '({difffrom})')}
     </td>
   </tr>'
 difffrom = '<a href="{url|urlescape}rev/{node|short}:{originalnode|short}{sessionvars%urlparameter}">diff</a>'

mercurial/templates/monoblue/map

@@ -129,7 +129,7 b" changesetparent = '"
   <dd>{changesetlink}</dd>'
 changesetparentdiff = '
   <dt>parent {rev}</dt>
-  <dd>{changesetlink} {ifeq(node, basenode, '(current diff)', \'({difffrom})\')}</dd>'
+  <dd>{changesetlink} {ifeq(node, basenode, '(current diff)', '({difffrom})')}</dd>'
 difffrom = '<a href="{url|urlescape}rev/{node|short}:{originalnode|short}{sessionvars%urlparameter}">diff</a>'
 filerevbranch = '<dt>branch</dt><dd>{name|escape}</dd>'
 filerevparent = '