fixed random access offsets

Jan Sablatnig requested to merge jansablatnig/liboggz:fix-random_access into master

My application reads OGG files with some random access (moving the current position via oggz_seek). This often fails to move to the correct point.

After further analysis, the root of the problem appears to be a missing page offset reset.

With this patch, my application works correctly even with fairly aggressive random access.

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