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vp9-rtc: Adjust thresh for 4x4 tx selection

For screen content nonrd_pickmode: reduce
threshold to select 4x4 tx_size, under certain
conditions.

Change-Id: If68c30172272868033f0e3011e53c76b4e7c48b6

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -370,7 +370,7 @@

       tx_size = TX_16X16;

     // For screen-content force 4X4 tx_size over 8X8, for large variance.

     if (cpi->oxcf.content == VP9E_CONTENT_SCREEN && tx_size == TX_8X8 &&

-        bsize <= BLOCK_16X16 && var > (ac_thr << 6))

+        bsize <= BLOCK_16X16 && ((var >> 5) > (unsigned int)ac_thr))

       tx_size = TX_4X4;

   } else {

     tx_size = VPXMIN(max_txsize_lookup[bsize],