fix typo in void init_src_params() in pickcdef.c

This merge request fixes a typo that cause incorrect MSE to be computed when searching for the best CDEF filter strengths in 4:2:2 chroma mode.

av1/encoder/pickcdef.c

diff --git a/av1/encoder/pickcdef.c b/av1/encoder/pickcdef.c
index e88cf87..3a755a3 100644
--- a/av1/encoder/pickcdef.c
+++ b/av1/encoder/pickcdef.c
@@ -254,7 +254,7 @@
   *width = block_size_wide[bsize];
   *height = block_size_high[bsize];
   *width_log2 = MI_SIZE_LOG2 + mi_size_wide_log2[bsize];
-  *height_log2 = MI_SIZE_LOG2 + mi_size_wide_log2[bsize];
+  *height_log2 = MI_SIZE_LOG2 + mi_size_high_log2[bsize];
 }
 
 /* Compute MSE only on the blocks we filtered. */