RDA: Don't apply stored monitor configuration if session is remote.

[sunweaver]

With remote sessions (like X2Go, xRDP, etc.) the xRandR configuration is normally handled by the remote desktop technology in use.

This change adds a return early to MATE's xrandr MSD monitor resolution restoring code path, if the session is remote.

Note: this PR requires a new build dependency on librda [1]

[1] https://github.com/ArcticaProject/librda.git

[lukefromdc]

Any updates on this or should we close it? Tabs need to go, and conflict needs to be fixed to continue with it

[lukefromdc]

This is actually worth finishing, so as to avoid risk of invalidating someone's local monitor setup during a remote connection