Fix a lo/hi-bitdepth mismatch due to sgr filter mixup

No STATS_CHANGED is observed

BUG=aomedia:2533

Change-Id: Ia1fd72272f0bcc6f426a3a44648869b95ffb8b7b

av1/encoder/pickrst.c

diff --git a/av1/encoder/pickrst.c b/av1/encoder/pickrst.c
index 0b26641..5409f96 100644
--- a/av1/encoder/pickrst.c
+++ b/av1/encoder/pickrst.c
@@ -624,7 +624,7 @@
                                   dat_stride, flt0, flt0_stride, H, C);
   } else if (params->r[1] > 0) {
     calc_proj_params_r1_high_bd_c(src8, width, height, src_stride, dat8,
-                                  dat_stride, flt0, flt0_stride, H, C);
+                                  dat_stride, flt1, flt1_stride, H, C);
   }
 }