Enable clippy::clone_on_copy (#8728)

This PR enables the
[`clippy::clone_on_copy`](https://rust-lang.github.io/rust-clippy/master/index.html#/clone_on_copy)
rule and fixes the outstanding violations.

Release Notes:

- N/A

crates/collab_ui/src/notifications/incoming_call_notification.rs

@@ -119,7 +119,7 @@ impl Render for IncomingCallNotification {
             let theme_settings = ThemeSettings::get_global(cx);
             (
                 theme_settings.ui_font.family.clone(),
-                theme_settings.ui_font_size.clone(),
+                theme_settings.ui_font_size,
             )
         };
 

crates/collab_ui/src/notifications/project_shared_notification.rs

@@ -123,7 +123,7 @@ impl Render for ProjectSharedNotification {
             let theme_settings = ThemeSettings::get_global(cx);
             (
                 theme_settings.ui_font.family.clone(),
-                theme_settings.ui_font_size.clone(),
+                theme_settings.ui_font_size,
             )
         };