patch 8.2.5043: can open a cmdline window from a substitute expression

Problem:    Can open a cmdline window from a substitute expression.
Solution:   Disallow opening a command line window when text or buffer is
            locked.
diff --git a/src/version.c b/src/version.c
index 18a1fdb..a15bb3e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5043,
+/**/
     5042,
 /**/
     5041,