patch 8.1.0429: no test for :lcd with 'shellslash'

Problem:    No test for :lcd with 'shellslash'.
Solution:   Add a test. (Daniel Hahler, closes #3475)
diff --git a/src/version.c b/src/version.c
index 724c9aa..c62e484 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    429,
+/**/
     428,
 /**/
     427,