patch 8.1.1454: build failure without the conceal feature

Problem:    Build failure without the conceal feature.
Solution:   Remove #ifdef.
diff --git a/src/version.c b/src/version.c
index 2cefa3b..f83f7cc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1454,
+/**/
     1453,
 /**/
     1452,