patch 8.1.2125: fnamemodify() fails when repeating :e

Problem:    Fnamemodify() fails when repeating :e.
Solution:   Do not go before the tail. (Rob Pilling, closes #5024)
diff --git a/src/version.c b/src/version.c
index 514f3c9..a7a7869 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2125,
+/**/
     2124,
 /**/
     2123,