patch 8.2.3794: Vim9: cannot find script-local func using "s:"

Problem:    Vim9: cannot find script-local func using "s:". (Yegappan
            Lakshmanan)
Solution:   Skip the "s:".

src/testdir/test_vim9_func.vim

@@ -1243,6 +1243,18 @@ def Test_set_opfunc_to_global_function()
   &operatorfunc = ''
 enddef
 
+def Test_use_script_func_name_with_prefix()
+  var lines =<< trim END
+      vim9script
+      func s:Getit()
+        return 'it'
+      endfunc
+      var Fn = s:Getit
+      assert_equal('it', Fn())
+  END
+  CheckScriptSuccess(lines)
+enddef
+
 def Test_lambda_type_allocated()
   # Check that unreferencing a partial using a lambda can use the variable type
   # after the lambda has been freed and does not leak memory.

src/userfunc.c

@@ -1885,13 +1885,14 @@ find_func_even_dead(char_u *name, int is_global, cctx_T *cctx)
     {
 	char_u	*after_script = NULL;
 	long	sid = 0;
-	int	find_script_local = in_vim9script()
-				     && eval_isnamec1(*name) && name[1] != ':';
+	int	find_script_local = in_vim9script() && eval_isnamec1(*name)
+					   && (name[1] != ':' || *name == 's');
 
 	if (find_script_local)
 	{
 	    // Find script-local function before global one.
-	    func = find_func_with_sid(name, current_sctx.sc_sid);
+	    func = find_func_with_sid(name[0] == 's' && name[1] == ':'
+				       ? name + 2 : name, current_sctx.sc_sid);
 	    if (func != NULL)
 		return func;
 	}

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3794,
 /**/
     3793,
 /**/