Send allow_screen_content flag for both key and intra only frames

BUG=webm:1311

Change-Id: I03c1043d17ed4e4ea22002473779a9612884c6c6

av1/decoder/decodeframe.c

@@ -3224,11 +3224,10 @@ static size_t read_uncompressed_header(AV1Decoder *pbi,
       memset(&cm->ref_frame_map, -1, sizeof(cm->ref_frame_map));
       pbi->need_resync = 0;
     }
-    if (frame_is_intra_only(cm))
-      cm->allow_screen_content_tools = aom_rb_read_bit(rb);
+    cm->allow_screen_content_tools = aom_rb_read_bit(rb);
   } else {
     cm->intra_only = cm->show_frame ? 0 : aom_rb_read_bit(rb);
-
+    if (cm->intra_only) cm->allow_screen_content_tools = aom_rb_read_bit(rb);
     if (cm->error_resilient_mode) {
       cm->reset_frame_context = RESET_FRAME_CONTEXT_ALL;
     } else {

av1/encoder/bitstream.c

@@ -3198,11 +3198,10 @@ static void write_uncompressed_header(AV1_COMP *cpi,
     write_sync_code(wb);
     write_bitdepth_colorspace_sampling(cm, wb);
     write_frame_size(cm, wb);
-    if (frame_is_intra_only(cm))
-      aom_wb_write_bit(wb, cm->allow_screen_content_tools);
+    aom_wb_write_bit(wb, cm->allow_screen_content_tools);
   } else {
     if (!cm->show_frame) aom_wb_write_bit(wb, cm->intra_only);
-
+    if (cm->intra_only) aom_wb_write_bit(wb, cm->allow_screen_content_tools);
     if (!cm->error_resilient_mode) {
       if (cm->intra_only) {
         aom_wb_write_bit(wb,