Connector_Phoenix_SPT: fix filename
Connector_Phoenix_SPT generator uses generated name:
PhoenixContact_SPT_1.5_4-H-3.5_1x04_P3.5_Horizontal_1990753
while the footprint MR (kicad-footprints!2584 (merged)) expects:
PhoenixContact_SPT_1.5_4-H-3.5_1x04_P3.5mm_Horizontal
This MR changes the file name template to remove the last numeric part number and add "mm" after pitch.
Edited by Carlos Nieves Ónega