shader: Make sure to use textureSize with the correct arguments
In the case of gsampler2DRect, there is no second argument to be provided to textureSize.
Makes the spec@arb_texture_rectangle@copyteximage rect samples=2 not crash.
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In the case of gsampler2DRect, there is no second argument to be provided to textureSize.
Makes the spec@arb_texture_rectangle@copyteximage rect samples=2 not crash.