le-browser: Remove strict dependency of firefox (currently set to 19.0)

This restriction was necessary due to problems with moonlight extension,
which is no longer supported by the community and was removed from
le-browser too.

le-browser/pacote/DEBIAN/control

@@ -5,5 +5,5 @@ Version:
 Maintainer: LE Maintainer <le-maintainer@c3sl.ufpr.br>
 Description: Linux Educacional 5 internet browser, Mozilla Firefox, and its plugins.
 Architecture: i386
-Pre-Depends: firefox (= 19.0+build1-0ubuntu0.12.04.1)
+Pre-Depends: firefox
 Depends: firefox-locale-pt, flashplugin-installer, totem-mozilla, icedtea-6-plugin, xul-ext-ubufox