JS: Remove global dependency that wasnt needed anyway

Author: asgerf

javascript/ql/lib/semmle/javascript/ApiGraphs.qll

@@ -1942,8 +1942,6 @@ module API {
           or
           name = any(DataFlow::PropRef pr).getPropertyName()
           or
-          AccessPath::isAssignedInUniqueFile(name)
-          or
           exists(AccessPath::getAnAssignmentTo(_, name))
           or
           name = DataFlow::PseudoProperties::arrayLikeElement()