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d3d11h264dec: Keep track of actually configured DPB size

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:d3d11h264dec-dpb-fix into master 
... instead of the largest we ever seen.
Note that d3d11h264dec element holds previously configured DPB size
for later decoder object re-open decision.

This is to fix below case:
1) Initial SPS, required DPB size is 6
  - decoder object is opened with DPB size 6
  - max_dpb_size is now 6
2) SPS update with resolution change, required DPB size is 1
  - decoder object is re-opened with DPB size 1
  - max_dpb_size should be updated to 1, but it didn't happen (BUG)
3) SPS update without resolution change, only required DPB size is updated to 6
  - decoder object should be re-opened but didn't happen
    because we didn't update max_dpb_size at 2).

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