tests(percy): Fix API Application snapshotting toast (#9310)

Fixes https://percy.io/getsentry/sentry/builds/907705

tests/acceptance/test_api.py

@@ -42,4 +42,6 @@ class ApiApplicationTest(AcceptanceTestCase):
 
         self.browser.click('[href="/settings/account/api/applications/"]')
         self.browser.wait_until_not('.loading')
+        self.browser.click_when_visible('.ref-toast')
+        self.browser.wait_until_not('.ref-toast')
         self.browser.snapshot('api applications - single application')