[Feature] Leftovers after Release (#303)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#303

static/js/pw.js

@@ -498,7 +498,8 @@ function draw(pathway, elem) {
         .enter().append("line")
         // Check if target is pseudo and draw marker only if not pseudo
         .attr("class", d => d.target.pseudo ? "link_no_arrow" : "link")
-        .attr("marker-end", d => d.target.pseudo ? '' : 'url(#arrow)')
+        .attr("marker-end", d => d.target.pseudo ? '' : d.multi_step ? 'url(#doublearrow)' : 'url(#arrow)')
+
 
     // add element to links array
     link.each(function (d) {