patch 8.2.2485: when sourcing a script again the script version isn't reset

Problem:    When sourcing a script again the script version isn't reset.
Solution:   Set sn_version to one when sourcing a script again. Clear
            sn_save_cpo properly. (closes #7608)
diff --git a/src/version.c b/src/version.c
index cbef3da..ca79c64 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2485,
+/**/
     2484,
 /**/
     2483,