Update maestro tests - home screen widget text (#6426)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/488551667048375/task/1210845436825540?focus=true

### Description
Updated the assertion text in the onboarding maestro test flow to match
the updated widget promotion text. Changed from "Try our search widget!"
to "Try our Home screen widget!".

### Steps to test this PR

Maestro tests should pass.

### NO UI changes

Author: anikiki

.maestro/onboarding/onboarding_dismiss_all_dialogs.yaml

@@ -54,4 +54,4 @@ tags:
       - runFlow: ../shared/browser_screen/click_on_tabs_button.yaml
       - tapOn: "New Tab"
       - assertVisible:
-          text: ".*Try our search widget!.*"
+          text: ".*Try our Home screen widget!.*"