Buffer ports in VFX Graph have an expand icon whereas they have no subports

Steps to reproduce:

1. Create any node using GraphicBuffer in a VFX graph (Sample GraphicsBuffer operator for instance)
2. Notice there's an expand icon next to the Buffer port. It's clickable but does nothing

Actual results: There's a useless expand icon on ports of GraphicsBuffer Type

Expected results: No expand icon should be displayed for non expandable types

Reproducible with versions:  

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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