patch 9.0.0506: line number argument for :badd does not work

Problem:    Line number argument for :badd does not work.
Solution:   Set the last cursor position in the new buffer. (closes #11161)
diff --git a/src/version.c b/src/version.c
index 9de0676..15f5e38 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    506,
+/**/
     505,
 /**/
     504,