Remove various ifdefs for old Qt + KF5 versions (!1552) · Merge requests · Plasma / Plasma Desktop

Another 3-pack of related clean-ups:

Remove remaining ifdefs for Qt 5 support

A few unrelated lines got reformatted by clang-format, too.

Remove an ifdef for QWaylandClient support < Qt 6.2

At the time of writing, the minimum requirement is already Qt 6.4.

Remove ifdefs for old-school KF5 KAuth includes

Remove various ifdefs for old Qt + KF5 versions