Only send OutputConfig sendApplied / sendFailed to the right resource
Summary:
I don't understand the original logic.
s_allResources contains /every/ resource, not just outputconfigurations.
Sending org_kde_kwin_outputconfiguration_send_applied to a wl_surface (for example),
results in an error.
The reason kwin doesn't currently crash is because we don't actually send
applied/failed after setting outputs. (which is another bug)
Test Plan: The existing unit test still passes.
Reviewers: Plasma, sebas
Reviewed By: Plasma, sebas
Subscribers: sebas, plasma-devel, Frameworks
Tags: Plasma on Wayland, Frameworks
Differential Revision: https://phabricator.kde.org/D7898