Chromium bin is chromium-browser on Fedora

We can include both as bmo-sensible will only show installed, and
"chromium" bin is not on Fedora at all.

dotfiles/bmo/sensible.ini

@@ -31,6 +31,7 @@
     browser = sugar-browse
     browser = firefox
     browser = chromium
+    browser = chromium-browser
 
     vplayer = vlc