[BUG] Store can't update flatpak packages from non-gpg verified remote

[Zakadius123]

When trying to update the nightly version of Nheko (for example) from the store, an error is given, telling the user that it is unable to update with an error 'Aborted due to failure (Can't pull from untrusted non-gpg verified remote)'

cosmic-store v: 0.1.0175382670224.04~cfdff01