gh-actions: Use /property instead of -p

Otherwise fails with:

```
MSBUILD : error MSB1006: Property is not valid.
Switch: Configuration:Debug
```

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

.github/workflows/ci.yml

@@ -21,8 +21,8 @@ jobs:
       # msbuild ${{ env.Solution_Path }} -p:Configuration:${{ env.Configuration }} -p:Platform:${{ env.Platform }}
       - name: Build solution
         run: |
-          msbuild SensorsComboDriver\SensorsComboDriver.sln -p:Configuration:${{ env.Configuration }} -p:Platform:${{ env.Platform }}
-          msbuild SimpleDeviceOrientationSensor\SimpleDeviceOrientationSensor.sln -p:Configuration:${{ env.Configuration }} -p:Platform:${{ env.Platform }}
+          msbuild SensorsComboDriver\SensorsComboDriver.sln /property:Configuration=${{ env.Configuration }} /property:Platform=${{ env.Platform }}
+          msbuild SimpleDeviceOrientationSensor\SimpleDeviceOrientationSensor.sln /property:Configuration=${{ env.Configuration }} /property:Platform=${{ env.Platform }}
         env:
           Configuration: ${{ matrix.configuration }}
           Platform: ${{ matrix.platform }}