monitor: replace cap_destroy() in identify_cap() rpc with capops_delete()
monitor: replace cap_destroy() in identify_cap() rpc with capops_delete()

Signed-off-by: Simon Gerber <13ba2e9de9ead0ea0b5f47504fb3a80bb9b1ee3b@inf.ethz.ch>

BarrelfishOS/barrelfish,8l/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,8l/barrelfish,8l/barrelfish,kishoredbn/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,8l/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,BarrelfishOS/barrelfish,8l/barrelfish,kishoredbn/barrelfish,kishoredbn/barrelfish,8l/barrelfish,BarrelfishOS/barrelfish