Adding a Wiimote with another one being already connected doesn't work

[auriamg]

When adding a second Wiimote after adding the first one I cannot use the first one anymore. I have to switch all of them off manually and then add them at the same time.

Steps to reproduce:
Start STK
Click Options
Click Controls
Click Add a device
Click Add Wiimote
Press 1+2 an Wiimote_1 and click OK, again click OK
Click Add a device
Click Add Wiimote
Press 1+2 an Wiimote_2 and click OK, again click OK

What I expect: Wiimote_1 is kept as first Wiimote, Wiimote_2 is second Wiimote
What I get: Wiimote_2 is registered as first Wiimote. Wiimote_1 is non-functional anymore, I have to long-press the power button to switch it off until I am able to reconnect both at the same time.

Migrated-From: https://sourceforge.net/apps/trac/supertuxkart/t/ticket/1153