patch 8.0.0986: terminal feature always requires multi-byte feature

Problem:    Terminal feature always requires multi-byte feature.
Solution:   Remove #ifdef FEAT_MBYTE, disable terminal without multi-byte.
diff --git a/src/version.c b/src/version.c
index ef0209e..6baf62b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    986,
+/**/
     985,
 /**/
     984,