Fix open .ino in file explorer

[torikulhabib]

Fix open .ino in file explorer Elementary OS

[matthijskooijman]

Looks ok at first glance, but I'm not so familiar with the desktop file. Do you happen to have a link to the relevant part of the specification that documents this %U placeholder?

[torikulhabib]

In elementary os file explorer cannot open without %U
https://superuser.com/questions/138433/what-is-the-u-command-in-all-my-programs-command

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