Fix app icon on linux when installing from generated jpackage file #59
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Before: CorreoMQTT has no icon in the dock on Ubuntu 20.04 with gnome shell 3.36.4 (I think this might has always been an issue on linux?). Also if you create a shortcut for correo on the dock, the application is started as a new window because the wm_class is not matching.
Also there is not the correct application name displayed in the status bar:
Solution:
All windows are grouped correctly under the same icon even if it is pinned as a shortcut on the dock.
Changes tested for deb, rpm and msi packages.
@farion Could you please update the commands in the wiki to match the new ones from .travis/build.bash? I am not allowed to do this I think.