function getNewVariantId(mFileNames, sOldVariantId) {
		return mFileNames.get(sOldVariantId) || sOldVariantId;
	}
Discards the model, initializes it again and returns the displayed adaptation.
@param {object} mPropertyBag - Object with parameters as properties
@param {sap.ui.core.Control} mPropertyBag.control - Control for which the request is done
@param {string} mPropertyBag.layer - Layer
@returns {string} Displayed adaptation id of the refreshed model

@private
@ui5-restricted sap.ui.fl, sap.ui.rta