patch 8.2.4306: no test for fixed perl filetype check

Problem:    No test for fixed perl filetype check.
Solution:   Add a test. Sort test functions.
diff --git a/src/version.c b/src/version.c
index 3d72eca..3ea8fe2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4306,
+/**/
     4305,
 /**/
     4304,