Remove unintended interface exports

src/utilities/modal.ts

@@ -1,4 +1,4 @@
-export interface ModalOptions {
+interface ModalOptions {
   onFocusOut?: (event: Event) => any;
 }
 

src/utilities/popover.ts

@@ -136,7 +136,7 @@ export default class Popover {
   }
 }
 
-export interface PopoverOptions {
+interface PopoverOptions {
   distance?: number;
   placement?:
     | 'auto'