Revert "Add meta_text to style metaline"

This reverts commit beb91fa094.

crates/collab_ui/src/notification_panel.rs

@@ -257,7 +257,7 @@ impl NotificationPanel {
                                                 } else {
                                                     "You declined"
                                                 },
-                                                style.meta_text.text.clone(),
+                                                style.read_text.text.clone(),
                                             )
                                             .flex_float()
                                             .into_any(),

crates/theme/src/theme.rs

@@ -674,7 +674,6 @@ pub struct NotificationPanel {
     pub icon_button: Interactive<IconButton>,
     pub unread_text: ContainedText,
     pub read_text: ContainedText,
-    pub meta_text: ContainedText,
     pub timestamp: ContainedText,
     pub button: Interactive<ContainedText>,
 }