flexoptix-app: 5.9.0 -> 5.11.0 and fixes
flexoptix-app: 5.9.0 -> 5.11.0 and fixes

This update is required because the autoupdater prevents the app from
running without being updated (which is not possible because it is a
store path).
So this updates the app and patches out the updater (essentially it
never thinks it needs to update, even though it prints on the command
line that it should).

Also fix the desktop item.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs