patch 8.2.1858: Vim9: filter functions return number instead of bool

Problem:    Vim9: filter functions return number instead of bool.
Solution:   Return v:true instead of one. (closes #7144)
diff --git a/src/version.c b/src/version.c
index 6ea39c0..cdecc3a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1858,
+/**/
     1857,
 /**/
     1856,