j3dcore: use the context() helper in one more place in JoglPipeline

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
j3dcore: fix typo in updateTexture3DBoundary in JoglPipeline

GL_TEXTURE_2D should be GL_TEXTURE_3D

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
j3dcore: update version to 1.6.0-pre9

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>