snapcraft.yaml: Update stage-packages

Clean up the stage-packages: to drop any unnecessary libraries and ensure all required libraries to maintain ABI compatibility are bundled in the snap.

resources/linux/snap/snapcraft.yaml

@@ -24,26 +24,22 @@ parts:
     plugin: dump
     source: .
     stage-packages:
+      - fcitx-frontend-gtk3
+      - gvfs-libs
       - libasound2
-      - libc++1
+      - libgconf-2-4
+      - libglib2.0-bin
+      - libgnome-keyring0
+      - libgtk-3-0
       - libnotify4
       - libnspr4
       - libnss3
       - libpcre3
       - libpulse0
+      - libsecret-1-0
       - libxss1
       - libxtst6
-      - libxkbcommon0
-      - libgtk-3-0
-      - libgdk-pixbuf2.0-0
-      - libglib2.0-bin
-      - unity-gtk2-module
-      - libappindicator1
-      - xdg-user-dirs
-      - libsecret-1-0
-      # TODO@joao @Tyriar check these deps
-      # - libatomic1
-      # - libgtk2.0-bin
+      - zlib1g
     prime:
       - -usr/share/dh-python