firefox: fix Icon path in desktop file

[ci skip]

srcpkgs/firefox/patches/fix-desktop-icon-path.patch

@@ -0,0 +1,11 @@
+--- taskcluster/docker/firefox-snap/firefox.desktop.orig	2019-01-18 19:31:39.428839442 +0100
++++ taskcluster/docker/firefox-snap/firefox.desktop	2019-01-18 19:32:20.689063456 +0100
+@@ -154,7 +154,7 @@
+ Terminal=false
+ X-MultipleArgs=false
+ Type=Application
+-Icon=/browser/chrome/icons/default/default128.png
++Icon=firefox
+ Categories=GNOME;GTK;Network;WebBrowser;
+ MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
+ StartupNotify=true

srcpkgs/firefox/template

@@ -4,7 +4,7 @@
 #
 pkgname=firefox
 version=64.0.2
-revision=1
+revision=2
 short_desc="Mozilla Firefox web browser"
 maintainer="Juan RP <xtraeme@voidlinux.org>"
 license="MPL-2.0, GPL-2.0-or-later, LGPL-2.1-or-later"