fix BuildModel.bat path

[trivalik]

got broken in 02eb6cb

[CLAassistant]

All committers have signed the CLA.

[opcfoundation-org]

Fixed independently.

[trivalik]

@opcfoundation-org Are you sure that it is fixed? it is still three times .. on master branch.

edit:
Repro:

• clone this repo
• compile solution file with Release configuration
• and execute the Buildmodel.bat in opened cmd
  output:

C:\Users\trivalik\Downloads\UA-ModelCompiler\Tests\DemoModel>BuildModel.bat
Building Model DemoModel
..\..\..\build\bin\Release\net9.0\Opc.Ua.ModelCompiler.exe compile -version v105 -exclude Draft -d2 ".\DemoModel.xml" -cg ".\DemoModel.csv" -o2 "." -useAllowSubtypes
Das System kann den angegebenen Pfad nicht finden.
Failed DemoModel

[opcfoundation-org]

There are two repos. The public repo is a copy of the primary repo which has gone through a complete refactoring.
The private repo needs to be synced again but it can't happen this week.