patch 8.2.3786: test fails because of using Vim9 syntax in legacy function

Problem:    Test fails because of using Vim9 syntax in legacy function.
Solution:   Add "call".

src/testdir/test_functions.vim

@@ -2239,7 +2239,7 @@ func Test_call()
       let Time = 'localtime'
       call Time()
   END
-  CheckScriptFailure(lines, 'E1085:')
+  call CheckScriptFailure(lines, 'E1085:')
 endfunc
 
 func Test_char2nr()

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3786,
 /**/
     3785,
 /**/