Fix unscrollable body when returning to desktop mode from mobile mode with navigation drawer open. (#6201)

* fix: only lock body when drawer is opened and not in desktop mode

* Reuse variable

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Co-authored-by: Dan Abramov <dan.abramov@gmail.com>

src/view/shell/index.web.tsx

@@ -32,8 +32,9 @@ function ShellInner() {
   const navigator = useNavigation<NavigationProp>()
   const closeAllActiveElements = useCloseAllActiveElements()
   const {_} = useLingui()
+  const showDrawer = !isDesktop && isDrawerOpen
 
-  useWebBodyScrollLock(isDrawerOpen)
+  useWebBodyScrollLock(showDrawer)
   useComposerKeyboardShortcut()
   useIntentHandler()
 
@@ -56,7 +57,7 @@ function ShellInner() {
       <Lightbox />
       <PortalOutlet />
 
-      {!isDesktop && isDrawerOpen && (
+      {showDrawer && (
         <TouchableWithoutFeedback
           onPress={ev => {
             // Only close if press happens outside of the drawer