bug when a tile contain multiple slices

[biaowang]

the corresponding code in VTM8.0

for( uint32_t j = 0; j < numSlicesInTile-1; j++ )
{

m_sliceMap[ i ].addCtusToSlice( getTileColumnBd(tileX), getTileColumnBd(tileX+1),

ctuY, ctuY + m_rectSlices[ i ].getSliceHeightInCtu(), m_picWidthInCtu);

ctuY += m_rectSlices[ i ].getSliceHeightInCtu();
i++;
m_sliceMap[ i ].setSliceID(i);

}

before m_sliceMap[ i ].setSliceID(i), a m_sliceMap[ i ].initSliceMap() is required, in order to clear up the ctu map inside, otherwise the ctu map would be accumulated in m_sliceMap[ i ];
will submit a MR soon.