Fix Ftrack custom attribute update

[iLLiCiTiT]

Issue

• object types without any specific custom attributes skip value changes of custom attributes even if happened on hierarchical custom attribute

Changes

• custom attribute update is not skipped until will check that modified values may be from hierarchical custom attribtes
• hierarchical custom attributes are not queried by configuration key but by configuration id
  • configuration key may be same as there may be hierarchical and non hierarchical custom attribute with same key

🏴	Pype 3.x PR
pype	#983