patch 8.2.0555: Vim9: line continuation is not always needed

Problem:    Vim9: line continuation is not always needed.
Solution:   Recognize continuation lines automatically in list and dict.
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index f34041b..a965bdf 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -767,7 +767,7 @@
 
   call CheckDefFailure("let x = #{8: 8}", 'E1014:')
   call CheckDefFailure("let x = #{xxx}", 'E720:')
-  call CheckDefFailure("let x = #{xxx: 1", 'E722:')
+  call CheckDefFailure("let x = #{xxx: 1", 'E723:')
   call CheckDefFailure("let x = #{xxx: 1,", 'E723:')
   call CheckDefFailure("let x = {'a': xxx}", 'E1001:')
   call CheckDefFailure("let x = {xxx: 8}", 'E1001:')