terminal: Change context menu item label (#25085)

Super subtle, but when I initially saw just "Close", I got weirded out
asking myself "why there's a menu item to close the context menu?", to
only then realize that it didn't close the menu, but the terminal _tab_.
Might be obvious, because that's how buffer tabs are labled, but I don't
know, it feels like the redundancy here is overall positive.

Release Notes:

- N/A

crates/terminal_view/src/terminal_view.rs

@@ -258,7 +258,7 @@ impl TerminalView {
                 })
                 .separator()
                 .action(
-                    "Close",
+                    "Close Terminal Tab",
                     Box::new(CloseActiveItem {
                         save_intent: None,
                         close_pinned: true,