patch 8.2.2652: Vim9: can use command modifier without an effect

Problem:    Vim9: can use command modifier without an effect.
Solution:   Give an error for a misplaced command modifier.  Fix error message
            number.
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index b6f3876..25db012 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -247,7 +247,7 @@
 def Test_exepath()
   CheckDefExecFailure(['echo exepath(true)'], 'E1174:')
   CheckDefExecFailure(['echo exepath(v:null)'], 'E1174:')
-  CheckDefExecFailure(['echo exepath("")'], 'E1142:')
+  CheckDefExecFailure(['echo exepath("")'], 'E1175:')
 enddef
 
 def Test_expand()
@@ -406,13 +406,13 @@
 def Test_finddir()
   CheckDefExecFailure(['echo finddir(true)'], 'E1174:')
   CheckDefExecFailure(['echo finddir(v:null)'], 'E1174:')
-  CheckDefExecFailure(['echo finddir("")'], 'E1142:')
+  CheckDefExecFailure(['echo finddir("")'], 'E1175:')
 enddef
 
 def Test_findfile()
   CheckDefExecFailure(['echo findfile(true)'], 'E1174:')
   CheckDefExecFailure(['echo findfile(v:null)'], 'E1174:')
-  CheckDefExecFailure(['echo findfile("")'], 'E1142:')
+  CheckDefExecFailure(['echo findfile("")'], 'E1175:')
 enddef
 
 def Test_flattennew()