Correct Windows build

Author: Lord-Grey

.github/workflows/qt5_6.yml

@@ -193,7 +193,7 @@ jobs:
         with:
           version: ${{ inputs.qt_version == '6' && '6.8' || '5.15.*' }}
           target: 'desktop'
-          modules: ${{ inputs.qt_version == '6' && 'qtserialport' && 'qtwebsockets' || '' }}
+          modules: ${{ inputs.qt_version == '6' && 'qtserialport qtwebsockets' || '' }}
           cache: 'true'
           cache-key-prefix: 'cache-qt-windows'