fix jp4 jumper conections for m50

[PGoski]

Investigated jumper connections in https://easyeda.com/editor#id=fb16afdb71434bf79588f97456e4c3c4 and I think I've found a mistake in m50nv & m50tu jp4 jumper configuration.

Here is DME 3.1 44 pin documentation :

Here is DME 3.3.1 44 pin documentation:

Here are screenshots with pin numbers in easyeda:

[pazi88]

Jumper configurations were ok. Only internal names in easyeda were mixed. The problem is fixed in easyeda, but this doesn't have effect on actual PCB.