patch 8.1.1731: command line history not read from viminfo on startup

Problem:    Command line history not read from viminfo on startup.
Solution:   Get history length after initializing it.
diff --git a/src/version.c b/src/version.c
index 69baf54..d8b3dfe 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1731,
+/**/
     1730,
 /**/
     1729,