Fixed vanilla bug where the server sends no more than 7 chunk radius.

Regardless of the render distance, previously you couldn't see more than 7 chunk radius. The reason of this - checking field `Chunk.field_150815_m` before sending chunk to client. This field sets by method `Chunk.func_150804_b(boolean)` which recalculates the lighting. I added call to this method when loading chunk. Now all chunks are sent correctly. 

And yes, this fix is completely tested.