Remove unnecessary Unicode and associated modeline

The latest change to votl.txt f05e091 added a modeline that generates an error every time I run :help votl

 **E21: Cannot make changes, 'modifiable' is off: fileencoding=utf8**

The error makes sense since the buffer is a non-modifiable help file. I messed around for some time trying to make it work with no success. If you really want it to be UTF-8, maybe set the [BOM](http://en.wikipedia.org/wiki/Byte_order_mark) using :set bomb.  But I don't see the point in that. The only Unicode is a couple of single quotes and the word regimé (which should be régime anyway ;-).  I've removed them and the modeline in this commit.