Fix window restoration bugs (#9358)

- [x] fixes https://github.com/zed-industries/zed/issues/9349
- [x] fixes https://github.com/zed-industries/zed/issues/4656
- [x] fixes https://github.com/zed-industries/zed/issues/8345

Release Notes:

- TODO

crates/collab_ui/src/collab_titlebar_item.rs

@@ -64,7 +64,7 @@ impl Render for CollabTitlebarItem {
             .w_full()
             .h(titlebar_height(cx))
             .map(|this| {
-                if cx.is_full_screen() {
+                if cx.is_fullscreen() {
                     this.pl_2()
                 } else {
                     // Use pixels here instead of a rem-based size because the macOS traffic