flatpak: Assign the right scope to runtimes
@joaquimrocha
Submitted by Joaquim Rocha Link to original bug (#787420)
Description
Runtimes are getting created with the scope of the GsFlatpak object that creates them, but this leads to problems because the runtime may actually be only installed or available in the counterpart installation.
This results in an error sometimes when an app that uses a runtime in the system needs to calculate it size and uses the wrong installation for that.