type error of geometry.line in fbs schema file

I think this is an error rather than an intensional type change:

> table Geometry_ {
> ...
> line: Box_; _// should be Line__
> }

And also the type of the argument in `FlatBuffersHelper.createLine`

Search the fbs schema for table Geometry_ and inspect FlatBuffersHelper.createLine, comparing the current types with the referenced Line__ and Box_ definitions. The change is complete when the geometry line field and createLine argument use the intended type and the project's existing build or tests pass.

Written by the indexing model from the issue text.