Fix BufferGeometry  field type
Fix BufferGeometry  field type

AgentME/DefinitelyTyped,mcliment/DefinitelyTyped,magny/DefinitelyTyped,georgemarshall/DefinitelyTyped,magny/DefinitelyTyped,markogresak/DefinitelyTyped,borisyankov/DefinitelyTyped,AgentME/DefinitelyTyped,borisyankov/DefinitelyTyped,AgentME/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,AgentME/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped