Small Visual Bug Fixes in VAB/SPH

v0.9.2 Just Small Visual Bug Fixes

Fixed:

• The laser beam lines now properly disappear when you remove symmetry parts in the VAB or SPH.
• Parts now render with color in the VAB/SPH parts bin. Appearently even if all you want is a simple flat monocolor shader, you sti
  ll need to use a texture image file for it in the way KSP works. For example, to make a simple bland flat surface in color RGB(1,0,
  0), you'd have to do it by making a small image file consisting of 1 single pixel in color RGB(1,0,0), and using that in a texture.
  Apparently the only shader effects that KSP enables when rendering the part icons is the texture image mapper. All other aspects o
  f shaders besides that one feature are turned off in the icon view, even for the shaders that come from KSP itself in PartTools.