Fix wiimotespeaker emulation affecting real wiimote

[kamiyo]

Added condition so that function to mix wiimote-speaker data into the master mixer is called only if wiimote is emulated.

[skidau]

@dolphin-emu-bot rebuild

[waddlesplash]

@skidau build succeded, and this LGTM but I'm not too familiar with this code though.

[comex]

I think this is actually this code being wrong:

void InterruptChannel(int _number, u16 _channelID, const void* _pData, u32 _Size)  
{   
    if (WIIMOTE_SRC_HYBRID & g_wiimote_sources[_number])                           
        ((WiimoteEmu::Wiimote*)s_config.controllers[_number])->InterruptChannel(_channelID, _pData, _Size);
}       

WIIMOTE_SRC_HYBRID = WIIMOTE_SRC_EMU | WIIMOTE_SRC_REAL, so it will trigger even if the actual value is "real". If that method were not called, it wouldn't get to the point changed in this patch.

[kamiyo]

I thought so at first, but the way this was written is that this passes through to the emulated wiimote regardless. The function in the emulated wiimote (WiimoteEmu.cpp line 817) receives the data, and passes it to WiimoteReal (line 845). That's all good. It's the HidOutputReport after that (line 849) that processes things for the emulator. I think that's how all the other Wiimote interrupts are processed.

Now, it may be that the HidOutputReport on line 849 isn't needed, but I doubt it.

Someone who knows more about this let me know if that makes sense.

edit: this is also how the ControlChannel is processed if I'm understanding it correctly.