window: Warn about development builds
With this commit, a message dialog pops up whenever a development build runs. This is meant to actually annoy, so that we're always reminded that things may not work as expected. Since the dialog can be dismissed with a single button press, it is not the end of the world. But people still should be aware that Settings is ~not~ meant to run with Flatpak, and that this is a development tool only.
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