patch 8.1.2156: first character after Tab is not highlighted

Problem:    First character after Tab is not highlighted.
Solution:   Remember the syntax attribute for a column.
diff --git a/src/version.c b/src/version.c
index 6de34d4..573b5cc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2156,
+/**/
     2155,
 /**/
     2154,