invalid_file_test: loosen error check w/tile-threading

The serial decode check is too strict for tile-threaded decoding as
there is no guarantee on the decode order nor which specific error
will take precedence. Currently a tile-level error is not forwarded so
the frame will simply be marked corrupt.

Change-Id: I51cf1e39e44bedeac93746154b36a4ccb2f059b1