Fix Event after @types/node changes

After merging my [recent PR](DefinitelyTyped/DefinitelyTyped#59905) for `@types/node`, I was alerted that a couple dependents of this package were failing to compile.  I have identified a fix that I believe should preserve the original behavior of this code while resolving those errors.  I don't know anything about Storybook, so if I'm wrong, or if there's a better fix for the issue, please feel free to do your own thing.

For background: I don't think Storybook, or the packages with failing `dtslint` runs, `storybook-readme` and `storybook-addon-jsx`, directly depend on `@types/node`, but it's common for frontend packages to install build tooling that does depend on the package.  This causes Node types to be introduced to the default `typeRoot`, so you wind up with Node types merged in with those in the DOM lib.  (Storybook may be a bit of an odd duck, because it looks like in some cases, React declares its own empty DOM interfaces in `@types/react/globals.d.ts`.)

At any rate, I hope the proposed fix works for you.

code/lib/api/src/modules/shortcuts.ts

@@ -92,14 +92,12 @@ export const defaultShortcuts: Shortcuts = Object.freeze({
 });
 
 const addonsShortcuts: AddonShortcuts = {};
-export interface Event extends KeyboardEvent {
-  target: {
+interface TaggedEventTarget extends EventTarget {
     tagName: string;
-    addEventListener(): void;
-    removeEventListener(): boolean;
-    dispatchEvent(event: Event): boolean;
     getAttribute(attr: string): string | null;
-  };
+}
+export interface Event extends KeyboardEvent {
+    target: TaggedEventTarget;
 }
 
 function focusInInput(event: Event) {