fix: remove extra space below progressbar section pages (#27)

The missing trailing comment after the Metropolis conversion was adding extraneous vertical space below progress bar section pages.

src/beamerinnerthememoloch.dtx

@@ -352,7 +352,7 @@
     (0,0)
     rectangle
     (\moloch@progressonsectionpage, \moloch@progressonsectionpage@linewidth);
-  \end{tikzpicture}
+  \end{tikzpicture}%
   \tikzexternalenable%
 }
 %    \end{macrocode}