vp9-denoiser: Increase threshold for mode re-evaluation.

Change-Id: I57a15aec1cb2d6638f5211d30c2c9f15fb62494f

vp9/encoder/vp9_pickmode.c

diff --git a/vp9/encoder/vp9_pickmode.c b/vp9/encoder/vp9_pickmode.c
index 095847a..1727201 100644
--- a/vp9/encoder/vp9_pickmode.c
+++ b/vp9/encoder/vp9_pickmode.c
@@ -1703,7 +1703,7 @@
         decision == FILTER_BLOCK &&
         cpi->noise_estimate.enabled &&
         cpi->noise_estimate.level > kLow &&
-        zero_last_cost_orig < (best_rdc.rdcost << 2)) {
+        zero_last_cost_orig < (best_rdc.rdcost << 3)) {
       // Check if we should pick ZEROMV on denoised signal.
       int rate = 0;
       int64_t dist = 0;