Set custom pleroma logo on upgrades

src/freedombone-app-pleroma

     sudo -u pleroma mix deps.clean --build mime
     sudo -u pleroma mix ecto.migrate
 
-    #pleroma_custom_logo "$PLEROMA_DIR"
+    pleroma_custom_logo "$PLEROMA_DIR"
 
     expire_pleroma_posts "$PLEROMA_DOMAIN_NAME" "$PLEROMA_EXPIRE_MONTHS"
     create_pleroma_blocklist