Android deployment settings file uses wrong key for qml-import-paths

The qt6_android_generate_deployment_settings() command writes out a deployment file with the contents of QT_QML_IMPORT_PATH set for a key named qml-import-path. It assumes only a single path is provided. The androiddeployqt tool expects the plural form of the key name, i.e. qml-import-paths and supports multiple paths. This key name mismatch goes silently undetected, with androiddeployqt effectively ignoring the specified import path.