Unskip the must check that date entered by the user is consistent scripting integration test for Firefox

Bug 1978027 has been fixed upstream 10 days ago, so this integration
test can be enabled for Firefox too now that it passed with recent
Nightly versions.

Author: timvandermeij

test/integration/scripting_spec.mjs

@@ -2463,13 +2463,6 @@ describe("Interaction", () => {
     it("must check that date entered by the user is consistent", async () => {
       await Promise.all(
         pages.map(async ([browserName, page]) => {
-          if (browserName === "firefox") {
-            // Skip the test for Firefox as it doesn't support timezone
-            // emulation for WebDriver BiDi yet.
-            // TODO: Remove this check once bug 1978027 is fixed.
-            return;
-          }
-
           await waitForScripting(page);
 
           await page.emulateTimezone("Pacific/Honolulu");