Disable intrabc under CONFIG_SHARP_SETTINGS

If any block in a frame uses the intrabc mode, loop filters would be
forced off for that frame. This may cause blocking artifacts and
PSNR drop. This patch disables the intrabc mode under
CONFIG_SHARP_SETTINGS.

BUG=aomedia:2319

STATS_CHANGED

Change-Id: I20719d6817d8331b36fb7c10271fd195fea0bdf4
diff --git a/av1/av1_cx_iface.c b/av1/av1_cx_iface.c
index 3356f08..69f2286 100644
--- a/av1/av1_cx_iface.c
+++ b/av1/av1_cx_iface.c
@@ -215,7 +215,7 @@
   1,                            // enable CFL uv intra mode usage for sequence
   1,                            // superres
   1,                            // enable palette
-  1,                            // enable intrabc
+  !CONFIG_SHARP_SETTINGS,       // enable intrabc
   1,                            // enable angle delta
 #if CONFIG_DENOISE
   0,   // noise_level