[graph] fix the contour program

We had incorrect number of POINTS passed (was 1, should be 2) and so
nodes circles weren't rendered properly.

src/external-deps/sigmajs-circle-with-contour.js

@@ -21,6 +21,15 @@ export default class NodeContourFastProgram extends AbstractNodeProgram {
 */
 
 export default class NodeContourFastProgram extends CircleNodeProgram {
+  constructor(gl) {
+    super(gl, vertexShaderSource, fragmentShaderSource, POINTS, ATTRIBUTES);
+    // NOTE super method above will set POINTS = 1 from CircleNodeProgram
+    // We need to overwrite this
+    // https://gitlab.iscpif.fr/gargantext/purescript-gargantext/issues/471
+    this.points = POINTS;
+    this.bind();
+  }
+
   //process(data: NodeDisplayData, hidden: boolean, offset: number): void {
   process(data, hidden, offset) {
     const array = this.array;