cleanup: Delete trailing newlines.

Delete trailing newlines from all files, except
tools/ci/success-http-headers.txt and tools/setup/dev-motd, where they
are significant, and static/third, where we want to stay close to
upstream.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

frontend_tests/node_tests/alert_words_ui.js

@@ -177,4 +177,3 @@ run_test('close_status_message', () => {
     close(event);
     assert(!alert.visible());
 });
-