r279 Camera textures incompatible with HQ filters

[Enjay]

With the filers enabled, the a camera texture is reduced in size. This happens with all multiplications but 4x is, obviously, the most extreme.

[Gez]

Add

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	// [BB] Don't try to upsample textures based off FCanvasTexture.
	if ( inputGLTexture->tex->bHasCanvas )
		return inputBuffer;

after

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	if ( inputGLTexture->bIsTransparent == 1 )
		return inputBuffer;

in gl_CreateUpsampledTextureBuffer