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_charsearch_utf8.vim b/src/testdir/test_charsearch_utf8.vim
index ade7dd4..399ac51 100644
--- a/src/testdir/test_charsearch_utf8.vim
+++ b/src/testdir/test_charsearch_utf8.vim
@@ -4,7 +4,7 @@
 endif
 
 " Test for t,f,F,T movement commands
-function! Test_search_cmds()
+func Test_search_cmds()
   new!
   call setline(1, "・最初から最後まで最強のVimは最高")
   1
@@ -17,6 +17,6 @@
   normal! ,
   call assert_equal([0, 1, 28, 0], getpos('.'))
   bw!
-endfunction
+endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab