Use ibus portal in snap

It's supported since snapd 2.46 that was released in August

snap/snapcraft.yaml

@@ -20,6 +20,8 @@ apps:
     environment:
       # Tell glib to use portals on file associations handling.
       GTK_USE_PORTAL: 1
+      # Use sandboxed ibus api
+      IBUS_USE_PORTAL: 1
     plugs:
       - alsa
       - audio-playback
@@ -174,16 +176,6 @@ parts:
     after:
       - mozjpeg
 
-  # Qt checks that ibus-daemon binary is present, otherwise doesn't work
-  ibus:
-    plugin: nil
-    stage-packages:
-      - ibus
-    stage:
-      - -./usr/lib/$SNAPCRAFT_ARCH_TRIPLET/libjpeg.so.8.2.2
-    after:
-      - mozjpeg
-
   ffmpeg:
     plugin: nil
     build-packages: