patch 8.2.4909: MODE_ enum entries names are too generic

Problem:    MODE_ enum entries names are too generic.
Solution:   use CH_MODE_.
diff --git a/src/version.c b/src/version.c
index 1eb14d0..79e89aa 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4909,
+/**/
     4908,
 /**/
     4907,