improv(startup_apps): change drawer title

The previous title was redundant since the search bar already says the same. And searching isn't the only action in the drawer, so the title didn't really fit.

cosmic-settings/src/pages/applications/startup_apps.rs

@@ -123,7 +123,7 @@ impl page::Page<crate::pages::Message> for Page {
                         self.add_application_context_view(directory_type.clone()),
                         crate::pages::Message::CloseContextDrawer,
                     )
-                    .title(fl!("startup-apps", "search-for-application"))
+                    .title(fl!("startup-apps", "add-startup-app"))
                     .header(search),
                 )
             }