CI: corrected windeployqt, try 1

.github/workflows/build.yml

@@ -72,7 +72,7 @@ jobs:
         qmake --version
         qmake %GITHUB_WORKSPACE%/client/traintastic-client.pro CONFIG+="release" DESTDIR=${{runner.workspace}}/build
         nmake
-        windeployqt --release --no-translations -no-system-d3d-compiler --no-opengl-sw traintastic-client.exe
+        windeployqt --release --no-translations -no-system-d3d-compiler --no-opengl-sw ${{runner.workspace}}/build/traintastic-client.exe
 
   build-server:
     name: server ${{matrix.config.name}}