Bug 909 - Reccreate GLJPanel's BufferedImage is no more sourced by singleton AWTGLPixelBuffer

GLJPanel must validate whether it's local BufferedImage's DataBuffer is sourced
by the current singleton AWTGLPixelBuffer.

Case:
GLJPanel-B has created a new singleton AWTGLPixelBuffer w/ increased size.
Previous created GLJPanel-A's local BufferedImage's DataBuffer is no more sourced
by the singleton AWTGLPixelBuffer and hence must be re-created.