Restore open behavior on screenshot capture

Summary: The effect of opening the screenshot after capturing was removed in D19765926.

Reviewed By: mweststrate

Differential Revision: D21571294

fbshipit-source-id: f3308d80e066cc01786c17323e4ff5f97c092de9

desktop/app/src/chrome/ScreenCaptureButtons.tsx

@@ -73,7 +73,7 @@ class ScreenCaptureButtons extends Component<Props, State> {
   captureScreenshot: Promise<void> | any = async () => {
     const {selectedDevice} = this.props;
     if (selectedDevice != null) {
-      await capture(selectedDevice);
+      await capture(selectedDevice).then(openFile);
     }
   };