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_options.vim b/src/testdir/test_options.vim
index d3ac21c..70f6b96 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -1,6 +1,6 @@
 " Test for options
 
-function! Test_whichwrap()
+func Test_whichwrap()
   set whichwrap=b,s
   call assert_equal('b,s', &whichwrap)
 
@@ -20,16 +20,16 @@
   call assert_equal('h', &whichwrap)
 
   set whichwrap&
-endfunction
+endfunc
 
-function! Test_isfname()
+func Test_isfname()
   " This used to cause Vim to access uninitialized memory.
   set isfname=
   call assert_equal("~X", expand("~X"))
   set isfname&
-endfunction
+endfunc
 
-function Test_wildchar()
+func Test_wildchar()
   " Empty 'wildchar' used to access invalid memory.
   call assert_fails('set wildchar=', 'E521:')
   call assert_fails('set wildchar=abc', 'E521:')
@@ -40,9 +40,9 @@
   let a=execute('set wildchar?')
   call assert_equal("\n  wildchar=<Esc>", a)
   set wildchar&
-endfunction
+endfunc
 
-function Test_options()
+func Test_options()
   let caught = 'ok'
   try
     options
@@ -53,9 +53,9 @@
 
   " close option-window
   close
-endfunction
+endfunc
 
-function Test_path_keep_commas()
+func Test_path_keep_commas()
   " Test that changing 'path' keeps two commas.
   set path=foo,,bar
   set path-=bar
@@ -63,7 +63,7 @@
   call assert_equal('foo,,bar', &path)
 
   set path&
-endfunction
+endfunc
 
 func Test_signcolumn()
   if has('signs')