Ouzel reset shader uniform buffer offset at wrong place.

[woc2006]

Code: master latest, sample project
Renderer: Metal

At RenderDeviceMetal.mm line 797, ouzel reset shaderConstantBuffer.offset = 0 if offset larger than it's size. But what if the shader buffer contains data which is committed yet.
I wrote a demo to draw 10k sprites with different uniforms, and only half of them are drawn correctly.

As shader buffer size is 1024 * 1024, and buffer alignment is 256, 1024 * 1024 = 256* (4*1024), it holds 4k uniforms at most.

[elnormous]

This is fixed in d053005