fix F.CrtYd of BG96
Datasheet: https://www.quectel.com/download/quectel_bg96_hardware_design_v1-4
Changed F.CrtYd to have 3mm in all corners also changed KICAD6_3DMODEL_DIR to KICAD7_3DMODEL_DIR
This change is also in BC66, BC95 and M95
Screenshot before:
Screenshot after:
