Make settings dialog scrollable

Summary: Make settings dialog content scrollable, which is more natural than scrolling the entire window, as reported in https://fb.workplace.com/groups/flippersupport/permalink/1063196077494383/

Reviewed By: nikoant

Differential Revision: D26015864

fbshipit-source-id: 8c74e105c290e62313e332ed1b47040eff548a97

desktop/app/src/chrome/SettingsSheet.tsx

@@ -104,8 +104,12 @@ class SettingsSheet extends Component<Props, State> {
         onCancel={this.props.onHide}
         width={570}
         title="Settings"
-        footer={footer}>
-        <FlexColumn>{contents}</FlexColumn>
+        footer={footer}
+        bodyStyle={{
+          overflow: 'scroll',
+          maxHeight: 'calc(100vh - 250px)',
+        }}>
+        {contents}
       </Modal>
     );
   }