ibus: missing installed file w/ gtk2 PACKAGECONFIG

In case gtk2 PACKAGECONFIG is enabled, do_package task fails
with the following error:

ERROR: ibus-1.5.26-r0 do_package: QA Issue: ibus: Files/directories were installed but not shipped in any package:
  /usr/lib/gtk-2.0/2.10.0/immodules/im-ibus.so

This patch adds the missing folder to the FILES variable.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
(cherry picked from commit c87c5d5614)
Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

meta-gnome/recipes-support/ibus/ibus.bb

@@ -30,6 +30,7 @@ FILES:${PN} += " \
     ${datadir}/dbus-1 \
     ${datadir}/GConf \
     ${datadir}/glib-2.0 \
+    ${libdir}/gtk-2.0 \
     ${libdir}/gtk-3.0 \
     ${libdir}/gtk-4.0 \
     ${systemd_user_unitdir} \