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_partial.vim b/src/testdir/test_partial.vim
index 3e968da..b180510 100644
--- a/src/testdir/test_partial.vim
+++ b/src/testdir/test_partial.vim
@@ -114,9 +114,9 @@
   call OuterCall()
 endfunc
 
-function! s:cache_clear() dict
+func s:cache_clear() dict
   return self.name
-endfunction
+endfunc
 
 func Test_script_function_in_dict()
   let s:obj = {'name': 'foo'}
@@ -136,10 +136,10 @@
   call assert_equal('bar', B())
 endfunc
 
-function! s:cache_arg(arg) dict
+func s:cache_arg(arg) dict
   let s:result = self.name . '/' . a:arg
   return s:result
-endfunction
+endfunc
 
 func Test_script_function_in_dict_arg()
   let s:obj = {'name': 'foo'}