CMake: Fix custom QT_DEPLOY_TRANSLATIONS_DIR on Windows

Pick-to: 6.5 6.6 6.7
Fixes: QTBUG-121880
Change-Id: I7747253ae2671b2d417b25f0a98bc13871a661e2
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

src/corelib/Qt6CoreDeploySupport.cmake

@@ -429,6 +429,7 @@ function(qt6_deploy_runtime_dependencies)
             --libdir    "${arg_BIN_DIR}"     # NOTE: Deliberately not arg_LIB_DIR
             --plugindir "${arg_PLUGINS_DIR}"
             --qml-deploy-dir "${arg_QML_DIR}"
+            --translationdir "${QT_DEPLOY_TRANSLATIONS_DIR}"
         )
         if(NOT arg_NO_OVERWRITE)
             list(APPEND tool_options --force)