fix: changed edgetype to default

floating was used as edgetype whilst floating wasn't available, ReactFlow automatically fell back to default. now it is changed to default in the code preventing potential unexpected behavior

ref: N25B-114

src/visualProgrammingUI/VisProgUI.tsx

@@ -57,7 +57,7 @@ const initialNodes = [
 const initialEdges = [{id: 'start-end', source: 'start', target: 'end'}];
 
 const defaultEdgeOptions = {
-    type: 'floating',
+    type: 'default',
     markerEnd: {
         type: MarkerType.ArrowClosed,
         color: '#505050',