Use same molex connectors for mini height sensor (IR sensor) board

[robm]

If the mini height sensor board used the same Molex connector as the ones for the DuetWifi etc. then the cable would hold on slightly better and I would have more spare crimp on connectors for that end of the cable.

[dc42]

On the original version 1 sensor I did use a Molex KK connector. Unfortunately it took up more room, making it impossible to fit the sensor below the heatsink of the E3D hot end.