Re-enable some chart tests when OpenGL2 backend is available
The OpenGL2 backend does not define a vtkOpenGL2ContextDevice2D class, so this test will not run when built with OpenGL2. Change it to run if OpenGL2 is enabled as the OpenGL2 backend requires higher than OpenGL version 2 OR if the OpenGL1 backend is enabled but Open GL version 2 is available. Added alternate baseline for TestScalarsToColors output to accommodate minor differences in OpenGL2 backend.
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