Route gamepad to second window setting is broken

The RemapControllerInput function call likely needs to be added back to the game viewport client as a fix. 

1. PIE in the editor with 2 clients and a gamepad plugged in
2. Enable "Route gamepad to second window"

Result: the gamepad is not routed to the second window

Expected: KBM controls one window, and the gamepad controls the other

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