gdk/wayland: Fix pointer-gestures version selection
version == GDK_ZWP_POINTER_GESTURES_V1_VERSION will fail if the compositor implements version 2 of pointer-gestures-v1.
cc @rmader
version == GDK_ZWP_POINTER_GESTURES_V1_VERSION will fail if the compositor implements version 2 of pointer-gestures-v1.
cc @rmader