fix(settings): do not enforce allowMultiple set for selection settings

src/features/settings/utils/settingsValidator.js

@@ -69,7 +69,7 @@ export const validateEntry = function validateEntry (entry, path) {
          }
          if (entry.type === 'selection') {
              validateSelectionOptions(entry.options, path);
-             if (typeof entry.allowMultiple !== 'boolean') {
+             if (typeof entry.allowMultiple !== 'boolean' && entry.allowMultiple) {
                  throw new Error(`[settings] "${path}.allowMultiple" must be a boolean`);
              }
          }