PNS-router: produces tracks with clearance error
# Description
With the example project and the steps below the PNS-router produces tracks which are too tight together --> resulting in clearance errors.
# Steps to reproduce
1. open attached project, open schematic+board: [routing_drc_clearance_error.zip](/uploads/3ee536f73e31db811d6bd39d4f9a0d91/routing_drc_clearance_error.zip)
2. set track-width == 0.4mm
3. set grid == 0.127mm
4. activate bottom copper layer
5. select router walkaround mode (see picture 1)
6. start routing from U1-Pad1, and run with the new track into the existing blue track (see picture 2). commit these track.
7. run DRC, get drc-clearance errors (see picture 3)
# KiCad Version
```
Application: KiCad PCB Editor x64 on x64
Version: 7.0.2-49-gc75672fd44, release build
Libraries:
wxWidgets 3.2.2
FreeType 2.12.1
HarfBuzz 6.0.0
FontConfig 2.14.1
Platform: Windows 10 (build 19044), 64-bit edition, 64 bit, Little endian, wxMSW
wxWidgets: 3.2.2 (wchar_t,wx containers)
Boost: 1.81.0
OCC: 7.6.3
Curl: 7.88.1-DEV
ngspice: 40
Compiler: Visual C++ 1934 without C++ ABI
Build settings:
KICAD_SPICE=ON
```
issue