eslint: Fix @typescript-eslint/no-unnecessary-boolean-literal-compare.

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

web/e2e-tests/lib/common.ts

@@ -302,7 +302,7 @@ export async function ensure_enter_does_not_send(page: Page): Promise<void> {
     await page.waitForSelector("#send_later_popover");
     const enter_sends = await page.$eval(
         ".enter_sends_choice input[value='true']",
-        (el) => el.checked === true,
+        (el) => el.checked,
     );
 
     if (enter_sends) {