[react-onsenui] Added AlertDialogButton (#42663)

https://onsen.io/v2/api/react/AlertDialogButton.html

types/react-onsenui/index.d.ts

@@ -5,6 +5,7 @@
 //                 Jemmyw <https://github.com/jemmyw>
 //                 Mikael Lirbank <https://github.com/lirbank>
 //                 Yuji Tabata <https://github.com/uztbt>
+//                 LBLZR_ <https://github.com/LaBlazer>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 
@@ -187,6 +188,12 @@ export class AlertDialog extends Component<{
     onPostHide?(): void,
 }, any> {}
 
+export class AlertDialogButton extends Component<{
+    onClick?(): void,
+    modifier?: string,
+    disabled?: boolean,
+}, any> {}
+
 export class Dialog extends Component<{
     onCancel?(): void,
     isOpen?: boolean,