patch 8.2.4104: Vim9: lower casing the autoload prefix causes problems

Problem:    Vim9: lower casing the autoload prefix causes problems.
Solution:   Always store the prefix with case preserved.
diff --git a/src/version.c b/src/version.c
index d0d9b62..52b75a6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4104,
+/**/
     4103,
 /**/
     4102,