wayland: Fix primary selection copy paste from X11 app to Wayland app

Merged Hans de Goede requested to merge jwrdegoede/mutter:wayland-primary-sel-fix into master

When primary_offer_receive checks if the requested mime_type is supported, it should check against the list of mime-type being advertised by us for the primary-selection, instead of the list for the clipboard.

Fixes: #702 (closed)

Edited by Hans de Goede

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