pcb: Remove 4-pin blind connector

The old concept was to have three connectors:

- 2-pin for contact loop
- 3-pin for AC supply (PE, N, L)
- 4-pin for blind connection (PE, N, L_UP, L_DOWN)

The new concept is:

- 2-pin for contact loop
- 3-pin for AC supply (L) and blind connection (L_UP, L_DOWN)

This saves the PCB space for one of the biggest parts. Furthermore it
reduces space constraints for the PCB routing.

The removed neutral and protective earth pins should not be a problem.
It is less convenient for mounting since additional connectors between
the supply and blind cable are required but apart from that N and PE
would not have safety benefits in the current design.

This used to be different when an aluminium case was considered at least
as option. But the requirements for PE connection of the two halves of
the housing would have a huge space requirement. Thus an anyway cheaper
plastic case is the current goal.

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