patch 8.2.2166: auto format doesn't work when deleting text

Problem:    Auto format doesn't work when deleting text.
Solution:   Make "x" trigger auto format. (closes #7504)
diff --git a/src/version.c b/src/version.c
index fe06be0..ac6fb12 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2166,
+/**/
     2165,
 /**/
     2164,