remove type field for some settings in the rule editor

right, the idea is that with most rules, the type dropdown is superfluous (and noisy).  In this code there are 21 settings, and 10 of them are fixed, which I'm guessing is why Philipp chose to list the fixed one (rather than the mutable ones).

But, by the way, aren't :style, :script, :input, and :send  always pointers?