patch 8.2.4818: no test for what 8.2.4806 fixes

Problem:    No test for what 8.2.4806 fixes.
Solution:   Add a test. (closes #10727)
diff --git a/src/version.c b/src/version.c
index e46816e..74b4625 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4818,
+/**/
     4817,
 /**/
     4816,