Disable screen content tools for RT mode

Improper use of screen tools caused encoder to select a wrong entropy
context and led to mismatch with decoder. Disabling screen tools for RT
mode

Change-Id: I559138a639c735aa1d946789620a175f7421d36f

av1/encoder/encoder.c

diff --git a/av1/encoder/encoder.c b/av1/encoder/encoder.c
index 27c91de..c4dc5d4 100644
--- a/av1/encoder/encoder.c
+++ b/av1/encoder/encoder.c
@@ -1031,7 +1031,7 @@
   seq->still_picture = (oxcf->limit == 1);
   seq->reduced_still_picture_hdr = seq->still_picture;
   seq->reduced_still_picture_hdr &= !oxcf->full_still_picture_hdr;
-  seq->force_screen_content_tools = 2;
+  seq->force_screen_content_tools = (oxcf->mode == REALTIME) ? 0 : 2;
   seq->force_integer_mv = 2;
   seq->order_hint_info.enable_order_hint = oxcf->enable_order_hint;
   seq->frame_id_numbers_present_flag =