Refactor window geometry save/restore code to be less fragile

This commit refactors the code a bit to define the window geometry
strings in one place and uses a common method to read and write them.

This makes future changes much less fragile and fixes a pre-existing bug
that had gone un-noticed which caused window positions to not be saved
on a per-resolution basis in addition to a per-display-arrangement
basis. Old strings are used if available to that people don't lose their
saved position data the first time they upgrade to KF 5.79.

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