terminal_view: Fix casing of popover menu entry (#44377)

This ensures that the casing of this entry aligns with other entries in
the app popover Menus.

Release Notes:

- N/A

---------

Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>

crates/terminal_view/src/terminal_panel.rs

@@ -167,7 +167,7 @@ impl TerminalPanel {
                                         // hence we focus that first. Otherwise, we'd end up without a focused element, as
                                         // context menu will be gone the moment we spawn the modal.
                                         .action(
-                                            "Spawn task",
+                                            "Spawn Task",
                                             zed_actions::Spawn::modal().boxed_clone(),
                                         )
                                 });