turn "ignore geometry" forcerule into a setrule

and btw. replace legacy "ignoreposition" by "ignoregeometry"

this will allow to use "apply initially" as "force" used to act
(ignore position on placement) and "force" to prevent clients
from reconfiguring themselves (to not break a tabgroup or to just
not be annoying)

BUG: 311720
CCBUG: 252314
REVIEW: 109691
FIXED-IN: 4.11