patch 8.2.1800: Vim9: memory leak if "if" condition is invalid

Problem:    Vim9: memory leak if "if" condition is invalid.
Solution:   Free ppconst earlier.
diff --git a/src/version.c b/src/version.c
index 893e5eb..d784589 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1800,
+/**/
     1799,
 /**/
     1798,