Fix a bunch of other low-hanging style lints (#36498)

- **Fix a bunch of low hanging style lints like unnecessary-return**
- **Fix single worktree violation**
- **And the rest**

Release Notes:

- N/A

crates/title_bar/src/collab.rs

@@ -189,7 +189,7 @@ impl TitleBar {
                             .as_ref()?
                             .read(cx)
                             .is_being_followed(collaborator.peer_id);
-                        let is_present = project_id.map_or(false, |project_id| {
+                        let is_present = project_id.is_some_and(|project_id| {
                             collaborator.location
                                 == ParticipantLocation::SharedProject { project_id }
                         });

crates/title_bar/src/onboarding_banner.rs

@@ -73,7 +73,7 @@ fn get_dismissed(source: &str) -> bool {
     db::kvp::KEY_VALUE_STORE
         .read_kvp(&dismissed_at)
         .log_err()
-        .map_or(false, |dismissed| dismissed.is_some())
+        .is_some_and(|dismissed| dismissed.is_some())
 }
 
 fn persist_dismissed(source: &str, cx: &mut App) {