Use SH for RJ45 shield pins

Implements the FP aspect of kicad-symbols!3925 (merged)

Abracon ARJP11A-MA and Amphenol RJMG1BD3B8K1ANR used numbered pins for the shields. KLC S3.7 requires them to be "SH".

Also shrink Amphenol RJMG1BD3B8K1ANR courtyard to hug the shield pins more.

Update the 3D model path variable (6 -> 7)

KLC violations:

Amphenol part:

• F7.2: Anchor not on pad 1 (pad 1 is called R1)
• F7.3: Pad one not rectangular (pad 1 called R1)

Abracon part: no errors.