x11/swayidle: drop ConsoleKit2 support

Upstream rejected basu patch to use ConsoleKit2 as logind alternative,
promising to drop logind support only to go back on the promise by
still maintaining the support. So, drop the patch as it gets in the
way during updates and confuses users with DBus errors[1].

This reverts commit c1c14aa6a4efd1baa30ee9a97083fe7728aabc4c.
This reverts commit c2abd42e59116a0f8130f76e2e468316d360c6bb.
This reverts commit 51bcedde1c13dd3926b2cdde56201d2c0b19dd51.
This reverts commit 9cd3f3cf9cf1a82367d340355508430d53e25033.

PR: 285553 [1]