test: check if present help center is enabled before tapping

Author: kilian-tennyson

example/e2e/maestro/ios/open-help-center.yaml

@@ -5,8 +5,11 @@ tags:
 ---
 - launchApp
 - tapOn: "Login as an Unidentified User"
+- assertVisible:
+      text: "Present Help Center"
+      enabled: true
 - tapOn: "Present Help Center"
-- tapOn: "Untitled collection"
 - assertVisible: "Untitled collection"
+- tapOn: "Untitled collection"