electric train can find partially electrified platform at choose-signal

[poppo]

When at choose-signal, electric train can not find other platform which is not fully electrified

So, I make patch for fix this bug.electrification_check_in_choose_signal_update.patch

[prissi]

It should not find the platform at all. Trains are supposed to go to the end of the platform.

Anyway, I applied your patch in r11822  but noted that the electric driving criteria was bonkers. Renovated that too. No a mixed engien train can still go on non-electrified track but with non-electric pwoer only (but both maintenance).