patch 8.1.0711: test files still use function!

Problem:    Test files still use function!.
Solution:   Remove the exclamation mark.  Fix overwriting a function.
diff --git a/src/testdir/test_listdict.vim b/src/testdir/test_listdict.vim
index 999d4db..19f1373 100644
--- a/src/testdir/test_listdict.vim
+++ b/src/testdir/test_listdict.vim
@@ -499,19 +499,19 @@
 endfunc
 
 " No remove() of write-protected scope-level variable
-func! Tfunc(this_is_a_long_parameter_name)
+func Tfunc1(this_is_a_long_parameter_name)
   call assert_fails("call remove(a:, 'this_is_a_long_parameter_name')", 'E795')
-endfun
+endfunc
 func Test_dict_scope_var_remove()
-  call Tfunc('testval')
+  call Tfunc1('testval')
 endfunc
 
 " No extend() of write-protected scope-level variable
-func! Tfunc(this_is_a_long_parameter_name)
+func Tfunc2(this_is_a_long_parameter_name)
   call assert_fails("call extend(a:, {'this_is_a_long_parameter_name': 1234})", 'E742')
 endfunc
 func Test_dict_scope_var_extend()
-  call Tfunc('testval')
+  call Tfunc2('testval')
 endfunc
 
 " No :unlet of variable in locked scope