wayland: Fix thinko in paired tablet loop filter

Carlos Garnacho requested to merge wip/carlosg/grouped-tablet-device-lookups into main

This condition is inverted of how it should be. Since pad focus relies on grouped devices lookups (e.g. pads not grouped with a tablet do not focus surfaces), this fixes issues in pad focus and event propagation to wayland clients.

Fixes: fff36549 - wayland: Check input device capabilities in tablet seats

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