fix wrong node modules' conditional exports order

[PPpro]

see the relative feedback: https://forum.cocos.org/t/topic/149932/527?u=_pp

our implementation should follow the standard nodejs consditional exports specification https://nodejs.org/api/packages.html#conditional-exports

[3dos]

I was going to ask for this, very nice to see this in your backlog! This would allow the use of many libs without the hassle of CJS default exports only.

[smallmain]

This problem has not been fixed in the 3.8.2 beta version.

[smallmain]

When the editor enters cocos, browser, the value with spaces is stored in project.json. I don’t know if this will cause problems.