Disable network.proxy.socks_remote_dns in the Unsafe Browser.

Else, the Unsafe Browser complains that "Iceweasel is configured to use a proxy
server that can't be found." and cannot connect to the Internet.

config/chroot_local-includes/usr/local/sbin/unsafe-browser

@@ -164,6 +164,8 @@ configure_chroot () {
         ${CHROOT}/etc/iceweasel/*/*.js
     echo 'user_pref("network.proxy.type", 0);' >> \
         ${CHROOT}/etc/iceweasel/profile/user.js
+    echo 'user_pref("network.proxy.socks_remote_dns", false);' >> \
+        ${CHROOT}/etc/iceweasel/profile/user.js
     rm -rf ${CHROOT}/etc/iceweasel/profile/extensions
 
     # Set a scary theme (except if we're using Windows camouflage)