Alternate title: _Applying #6684-similar fix to stroke_
#6684 makes sure the "current" transformation, at the moment of filling radial gradients is the `baseTransform` (that of the rescource (page), as it says in the specs). However, this should also be fixed in [`CanvasGraphics_stroke`](https://github.com/dsprenkels/pdf.js/blob/a9081653fc565eb72c3eb5142c17088cb162e7ce/src/display/canvas.js#L1052).

case 2:
          tmp1 = ps[15];
          tmp2 = ps[11];
          ps[12] = ps[3];  ps[13] = pi + 0; ps[14] = pi + 1;   ps[15] = pi + 2;
          ps[ 8] = ps[7];   ps[11] = pi + 3;
          ps[ 4] = tmp2;    ps[ 7] = pi + 4;
          ps[ 0] = tmp1;  ps[ 1] = pi + 7;   ps[ 2] = pi + 6;  ps[ 3] = pi + 5;
          tmp1 = cs[3];
          cs[2] = cs[1]; cs[3] = ci;
          cs[0] = tmp1;  cs[1] = ci + 1;
          break;
        
        case 3:
          ps[12] = ps[0];  ps[13] = pi + 0;   ps[14] = pi + 1; ps[15] = pi + 2;
          ps[ 8] = ps[1];   ps[11] = pi + 3;
          ps[ 4] = ps[2];   ps[ 7] = pi + 4;
          ps[ 0] = ps[3];  ps[ 1] = pi + 7;   ps[ 2] = pi + 6; ps[ 3] = pi + 5;
          cs[2] = cs[0]; cs[3] = ci;
          cs[0] = cs[1]; cs[1] = ci + 1;
          break;
      }
      
      ps[5] = coords.length;
      coords.push([
        (-4 * coords[ps[0]][0] -
          coords[ps[15]][0] +
          6 * (coords[ps[4]][0] + coords[ps[1]][0]) -
          2 * (coords[ps[12]][0] + coords[ps[3]][0]) +
          3 * (coords[ps[13]][0] + coords[ps[7]][0])) /
          9,