Omron B3FS-105xP: Changed pin material different from metal body part.

[cnieves1]

Fix for #647

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items as you complete them:

• A screenshot of the model(s) aligned with KiCad footprints is very useful
• Was the 3D model(s) created in a mechanical modelling program?
• Source files (or scripts) have been contributed
• Step model submitted in 1:1 scale
• WRL model submitted in 1:2.54 scale
• 3D model alignment checked against KiCad footprint
• WRL model uses correct material properties
• Geometry check performed against mechanical models

[cnieves1]

@easyw @chmorgan can you review this?

[chmorgan]

@easyw this looks good to me now, both in kicad 3d and in freecad. Can you confirm?

[easyw]

@chmorgan @cnieves1
this time seems fine! thx
PS @chmorgan could you ave a look at this issue?