Fix VTK based assembly export rotation issue

[lorenzncode]

To resolve #1069. As a test, I'm checking a line of the VRML file itself. The file is less than 50 lines.

#VRML V2.0 utf8
# VRML file written by the visualization toolkit

    Background {
    skyColor [1.000000 1.000000 1.000000, ]
    }
     Viewpoint
      {
      fieldOfView 0.523599
      position -1.000000 0.000000 1.931852
      description "Default View"
      orientation 0 0 1 0
      }
    NavigationInfo {
      type ["EXAMINE","FLY"]
      speed 4.000000
      headlight TRUE}

    DirectionalLight { ambientIntensity 1 intensity 0 # ambient light
      color 1.000000 1.000000 1.000000 }

    Transform {
      translation 0 0 0
      rotation 1 0 0 1.5707963267948966
      scale 1 1 1
      children [
        Shape {
          appearance Appearance {
            material Material {
              ambientIntensity 0
              emissiveColor 0 0 0
              diffuseColor 1 1 1
              specularColor 0 0 0
              shininess 0.0078125
              transparency 0
              }
            }
          geometry PointSet {
            coord Coordinate {              point [                            -1 0 0,
              ]
            }
          }
        }
      ]
    }

rotation 1 0 0 1.5707963267948966

This is X rotation, 90 degrees.

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.32%. Comparing base (c57b849) to head (ba73f36).
Report is 328 commits behind head on master.

Files	Patch %	Lines
tests/test_exporters.py	94.73%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1078   +/-   ##
=======================================
  Coverage   96.32%   96.32%           
=======================================
  Files          40       40           
  Lines        9407     9427   +20     
  Branches     1248     1251    +3     
=======================================
+ Hits         9061     9081   +20     
  Misses        204      204           
  Partials      142      142           

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[jmwright]

Looks good, thanks @lorenzncode

[adam-urbanczyk]

LGTM, merging. Thanks @lorenzncode