add -f on windows again

Author: Pedro Jesus

.github/workflows/dotnet-windows.yml

@@ -55,7 +55,7 @@ jobs:
 
     - name: Build Sample app (Windows)
       run: |
-          dotnet build ${{env.SAMPLE_CSPROJ}} -c Release
+          dotnet build ${{env.SAMPLE_CSPROJ}} -c Release -f net10.0-windows10.0.19041.0
       shell: cmd
 
     # Android builds using dotnet build