Vivado pnr fix

[GCHQDeveloper147]

Relates to issue #334.

[olofk]

Patch looks perfectly fine, but there are some formatting changes required to pass the Format CI check.

The recommended solution is to set up pre-commit (see https://edalize.readthedocs.io/en/latest/dev/setup.html for details) so that the code is automatically checked and reformatted upon committing

[olofk]

My apologies for the delay. Picked and pushed! Thank you for your contribution