n64: enable rumble support for homebrew

[hackgrid]

Before this PR, mia always assigned the rumble pak + controller pak to homebrew ROMs without an known ID:

ares/mia/medium/nintendo-64.cpp

Line 624 in fa0f9a7

rpak = true;

Because the desktop-ui ALWAYS assigns controller pak to controller #1 and rumble paks ONLY to controller #2-3,
rumble never worked at all for these unknown homebrew games.

ares/desktop-ui/emulator/nintendo-64.cpp

Line 148 in fa0f9a7

if(!transferPakConnected) {

This fixes this problem by not enabling controller pak for not known homebrew games.

I guess this should be fine, because I think most homebrew devs will use flash or sram for saving, instead of controller pak,
because the save space is very limited on controller pak for indivudal games and there is no advantage using it.

[rasky]

I wouldn’t change the default based on reasoning, the backward compatibility is also a concern. The best solution would be to implement the full homebrew header that also defines requested controller configurations:
https://n64brew.dev/wiki/ROM_Header

I wouldn’t change defaults before there’s a way to override it