The "Replay" button wrongly generates two "play" method

[Softvision-CristinaBadescu]

[Affected versions]:

• Firefox 59.0.2 unbranded
• Firefox Developer Edition 60.0b14
• Min-Vid Shield Study Onboarding 0.4.7 - Shield Study

[Affected Platforms]:

• All Windows

[Prerequisites]:

• Latest Min-Vid v.0.4.7 Shield Study Onboarding ("active" or "activeAndOnboarding" variant) was previously installed on a clean profile.

[Steps to reproduce]:

1. Open the browser with the profiles from prerequisites and navigate to YouTube.
2. Send a video to the player and wait for it to end.
3. Click the "Replay" button.
4. Go to "about:telemetry" and observe the event and method of the ping generated by the "Replay" action.

[Expected result]:

• one "replay_view" event and "replay" method ping is displayed.

[Actual result]:

• two "player_view" event and "play" method pings are displayed.
• one "replay_view" event and "replay" method ping is displayed.

[Notes]:

• Here is a screen recording of the issue: https://goo.gl/dV29yr