patch 8.2.4068: Vim9: import test fails

Problem:    Vim9: import test fails.
Solution:   Add missing change.

src/scriptfile.c

@@ -1274,7 +1274,8 @@ do_source(
 
     // See if we loaded this script before.
     sid = find_script_by_name(fname_exp);
-    if (sid > 0 && ret_sid != NULL)
+    if (sid > 0 && ret_sid != NULL
+			  && SCRIPT_ITEM(sid)->sn_state != SN_STATE_NOT_LOADED)
     {
 	// Already loaded and no need to load again, return here.
 	*ret_sid = sid;

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4068,
 /**/
     4067,
 /**/