Gigya Field Override settings don't use proper token type

Problem/Motivation

Gigya Field have Override default settings options to add tokens specific settings to a node or an entity, currently gigya module loads the tokens_list for the node regardless of the entity type of the field is on, which prevent using tokens in field collection or other entities.

Proposed resolution

load the available token list for the entity the field belong to.

User interface changes

N/A