Don't define B_SPINLOCK_INITIALIZER for test app_server

 * I don't know what I am doing here, but the test app_server only
   ever built for me recently when I disabled the define, so I might
   as well commit this...
app_server: store and restore fill rule...

...when sending the whole view state over the link.
Also inherit the fill rule when pushing states (DrawState
copy constructor). A somewhat sloppy oversight, I must add.