Widen section labels on swissen template

I noticed that on the swissen template, the word "experience" was a bit
too long to use as a section label. Given that this is a pretty short
word, and also a very common section label for résumés, I widened the
section labels from 16% of the total width to 20% (and reduced the width
of the main text area to match) for both html and pdf renderings.

templates/swissen/css/resume.css

@@ -133,7 +133,7 @@ ul dl {
 ol {
     margin: 0;
     padding: 0 0 .75em;
-    width: 84%;
+    width: 80%;
     display: inline-block;
 }