Update flatpak build to use FreeRDP3
Description
Allow for remmina flatpak to use FreeRDP3 instead of FreeRDP2.
Motivation and Context
Build from source has a compiler option to use FreeRDP2 and FreeRDP3, but the snap was updated earlier to use FreeRDP3 by default. This is to get the flatpak up to date.
How Has This Been Tested?
Tested on Wayland and x11 desktops.
Types of changes
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Bug fix (non-breaking change which fixes an issue) -
New feature (non-breaking change which adds functionality) -
Breaking change (fix or feature that would cause existing functionality to change)
Checklist:
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My code follows the code style of this project. -
My change requires a change to the documentation. -
I have updated the documentation accordingly.