wm/ibus: Don't disable the panel

Without the panel service we'll have no candidate window. Until such point
as Budgie itself supports a candidate window over dbus, then we'll use
this one.

Distributions may opt to patch/override settings for ibus to not use the
tray icon (as it's kinda ugly, let's be honest.)

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

src/wm/ibus.vala

@@ -78,7 +78,7 @@ public class IBusManager : GLib.Object
      */
     private void startup_ibus()
     {
-        string[] cmdline = {"ibus-daemon", "--xim", "--panel", "disable"};
+        string[] cmdline = {"ibus-daemon", "--xim"};
         try {
             new Subprocess.newv(cmdline, SubprocessFlags.NONE);
         } catch (Error e) {