RAPPS - Shall not ask user about "Remove from registry" when no app is selected

reactos-bootcd-0.4.15-dev-7366-g40131fd-x86-gcc-lin-dbg

• Start RAPPS
• No selected installed app
• Menu "Remove from Registry"
• RAPPS askes user for confirmation, while no action is done whatever the answer
• Expected result : no question / no action when no application, like for the "Uninstall" menu command
• Guilty code : RemoveSelectedAppFromRegistry https://git.reactos.org/?p=reactos.git;a=blob;f=base/applications/rapps/gui.cpp;hb=6c93f3ca6b95fa5e1806fc29295d3bc8ada979f9#l263 

Fix : RAPPS.patch