Fix LESS font-name identification

Fixes a bug in LESS files where no font name would be found in contexts without a trailing delimiter. For example, after typing:
```
font-family: 
```
no intermediate font names are be found, and so the hint list is never filtered. The problem doesn't appear if there is a trailing semicolon.

This is a high priority bug for Edge Code. 

CC @bchintx, @pthiess @ryanstewart