patch 8.2.3008: startup test may hang

Problem:    Startup test may hang.
Solution:   Add quit command in the script.

src/testdir/test_startup.vim

@@ -1305,9 +1305,10 @@ func Test_echo_true_in_cmd()
   let lines =<< trim END
       echo v:true
       call writefile(['done'], 'Xresult')
+      quit
   END
   call writefile(lines, 'Xscript')
-  if RunVim([], [], '--cmd "source Xscript" --c q')
+  if RunVim([], [], '--cmd "source Xscript"')
     call assert_equal(['done'], readfile('Xresult'))
   endif
   call delete('Xscript')

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3008,
 /**/
     3007,
 /**/