react-bootstrap: add restoreFocus prop to Modal (#38424)

The `restoreFocus` prop was added to react-bootstrap in this commit from
2017 that was first released in v0.30.8.

https://github.com/react-bootstrap/react-bootstrap/commit/bd76a90d4780c834b4620c423e38b40c66a80882

types/react-bootstrap/index.d.ts

@@ -15,6 +15,7 @@
 //                 Andrew Makarov <https://github.com/r3nya>
 //                 Duong Tran <https://github.com/t49tran>
 //                 Erik Zivkovic <https://github.com/bes>
+//                 Collin Green <https://github.com/collingreen>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 

types/react-bootstrap/lib/Modal.d.ts

@@ -26,6 +26,7 @@ declare namespace Modal {
         dialogComponent?: any; // TODO: Add more specific type
         dialogTransitionTimeout?: number;
         enforceFocus?: boolean;
+        restoreFocus?: boolean;
         keyboard?: boolean;
         onBackdropClick?: (node: HTMLElement) => any;
         onEscapeKeyDown?: (node: HTMLElement) => any;