patch 8.2.4324: Vim9: script-local function name can start with "_"

Problem:    Vim9: script-local function name can start with "_".
Solution:   Check for leading capital after "s:".  Correct error message.
diff --git a/src/version.c b/src/version.c
index 2d0bb2d..cefbd40 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4324,
+/**/
     4323,
 /**/
     4322,