Don't remove surface mode both cutting mesh areas.

[BagelOrb]

The polylines are recomputed by the stitching, so they should be cleared. However, the polygons should not be cleared for surface mode BOTH. They are already cleared for surface mode SURFACE, 35 lines above at line 150.

[BagelOrb]

I don't remember which bug this solves exactly, but judging from the code it should solve a bug where surface mode both would not generate any surface geometry in case of cutting meshes.

However, I'm not able to reproduce the bug in 5.1.0 pyramid_mesh_surface_mode_cutting_mesh.zip

[github-actions[bot]]

Unit Test Results

25 tests  ±0   25 :heavy_check_mark: ±0   7s :stopwatch: -1s   1 suites ±0     0 :zzz: ±0    1 files   ±0     0 :x: ±0 

Results for commit 4a389e9d. ± Comparison against base commit 06364d5e.

[BagelOrb]

Reproduced bug in main:

With the fix:

cutting_surface_mode_both_bug.zip

[BagelOrb]

@devs see CURA-9534