gui(vnet): Fix for Wrong name for an argument in a call

[echoix]

My description: typo where the closing parentheses of int() spanned two arguments instead of only wrapping one.

Generated AI PR text in my fork was:

The fix is to correct the keyword arguments in the GetNearestNodeCat call so they match that function’s expected parameter names, while preserving behavior.

Best fix in this snippet:

• In gui/wxpython/vnet/vnet_core.py, inside _runTurnsAn, replace the malformed call:
  • remove field=... (unsupported),
  • remove tresh=... from inside int(...) (invalid),
  • pass layer=int(params["turn_cat_layer"]) and tresh=params["max_dist"] directly to GetNearestNodeCat.
• Keep existing logic intact otherwise.

No new imports, methods, or dependencies are needed.

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