temporarily address #231 (#232)

Hmmmm, so is the issue closeable or not?

I guess in the ideal case the data(thickness) edge style doesn't
apply to all edges, just non-dup edges, and then there's no risk
of redundancy or whatevs. but for now this solution works fine
(and i actually kinda line the new way dup edges are styled, they're
like big slinkies -- calls out the fact that they're not real).

metagenomescope/support_files/js/drawer.js

@@ -437,6 +437,10 @@ define([
                         selector: "edge.is_dup",
                         style: {
                             "line-style": "dashed",
+                            // TODO FIXME? see
+                            // github.com/marbl/MetagenomeScope/issues/231
+                            width: 35,
+                            "line-dash-pattern": [5, 5],
                         },
                     },
                     {