Unsafe Browser: delete proxy settings in all Iceweasel pref files.

They have just moved to 000-tor-browser.js. I don't want to have to adapt this
script every time it happens.

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

@@ -160,8 +160,8 @@ configure_chroot () {
     chroot ${CHROOT} apt-get remove --yes xul-ext-*
 
     # Disable proxying in the chroot
-    sed -i '/^user_pref("network\.proxy\..*",/d' \
-        ${CHROOT}/etc/iceweasel/profile/user.js
+    sed -r -i '/^(user_|)pref\("network\.proxy\..*",/d' \
+        ${CHROOT}/etc/iceweasel/*/*.js
     echo 'user_pref("network.proxy.type", 0);' >> \
         ${CHROOT}/etc/iceweasel/profile/user.js
     rm -rf ${CHROOT}/etc/iceweasel/profile/extensions