Adjustment of tests for OCCT 6.9.1:

Adjustment of tests for OCCT 6.9.1:

- de iges_1 L8,P7 - corrected according to changes made in #24682, with minor amendment of number of labels
- heal wire_tails_real A5 - corrected as in master
- offset wire_unclosed_outside_0_025 B4 - correcting according to actual state (looks better)
- de step_3 F1 - corrected according to actual state, see #26597
- de iges_1 N9 - reverted to state before integration of #25593 (zero-area face is created due to self-intersecting wire)