Fix sampler params not respecting active texture unit#201
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This fixes sampler params (such as min/mag filters) for the case that the texture already had been bound in a previous draw call. In this case, the new sampler params were applied to the currently active texture unit (as in
glActiveTexture) instead of the texture unit to which the texture was actually bound.(In the future, it'd be nice to be able to add unit tests for catching such issues!)