Remove unnecessary #ifdef

The line of code is already within the scope
of an #if CONFIG_EC_MULTISYMBOL.

Change-Id: I62e28c8586f5d04a1e1be4ea5a2551d3123fde9f

av1/decoder/decodeframe.c

@@ -4725,9 +4725,7 @@ static int read_compressed_header(AV1Decoder *pbi, const uint8_t *data,
 #else
   av1_set_mv_cdfs(&fc->nmvc);
 #endif
-#if CONFIG_EC_MULTISYMBOL
   av1_set_mode_cdfs(cm);
-#endif
 #endif
 
   return aom_reader_has_error(&r);