Update flatpak repo to 5.30.80, fix flatpak build error

dev.aunetx.deezer.appdata.xml

@@ -20,6 +20,7 @@
     <kudo>HiDpiIcon</kudo>
   </kudos>
   <releases>
+    <release version="5.30.80" date="2021-10-13" />
     <release version="5.30.0.beta" date="2021-10-13" />
   </releases>
   <content_rating type="oars-1.1" />

dev.aunetx.deezer.yml

@@ -75,7 +75,7 @@ modules:
         npm run prepare-flatpak -- $ELECTRON_BUILDER_ARCH_ARGS
 
       # Bundle app and dependencies
-      - cp -a dist/linux*unpacked /app/main
+      - cp -a ../artifacts/${ELECTRON_BUILDER_ARCH_ARGS:2}/linux*unpacked /app/main
 
       # Install app wrapper
       - install -Dm755 -t /app/bin/ ../run.sh