patch 9.1.0900: Vim9: digraph_getlist() does not accept bool arg

Problem:  Vim9: digraph_getlist() does not accept bool argument
          (Maxim Kim)
Solution: accept boolean as first argument (Yegappan Lakshmanan)

fixes: #16154
closes: #16159

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_digraph.vim b/src/testdir/test_digraph.vim
index 16eb0b1..88b8ded 100644
--- a/src/testdir/test_digraph.vim
+++ b/src/testdir/test_digraph.vim
@@ -605,8 +605,10 @@
   " of digraphs returned.
   call assert_equal(digraph_getlist()->len(), digraph_getlist(0)->len())
   call assert_notequal(digraph_getlist()->len(), digraph_getlist(1)->len())
+  call assert_equal(digraph_getlist()->len(), digraph_getlist(v:false)->len())
+  call assert_notequal(digraph_getlist()->len(), digraph_getlist(v:true)->len())
 
-  call assert_fails('call digraph_getlist(0z12)', 'E974: Using a Blob as a Number')
+  call assert_fails('call digraph_getlist(0z12)', 'E1212: Bool required for argument 1')
 endfunc