TILE_GROUPS: omit tile length from last tile in the frame.
This change improves efficiency and means that tile groups cause negligible loss (+0.03% BDR) in the current default encoding configurations (1 tile group no matter how many tiles) with frame-based wrapping. In future, when wrapper formats support tile groups, lengths can be omitted from the last tile in every tile group. Change-Id: Ia701e6720208fbfa727f9aef0b692a6aafbcc93f
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