Fix eq apply-to-all in preferences.

* slotLoadEffectChainInSlot was deleted, so the emit did nothing.  Create
  a function to fix that behavior.
* Don't instant-apply eq and quickeffect selections -- wait for the user to hit apply.
  (Otherwise, what's the point of an apply button?)

fixes lp:1404525
That must not be done for EQs since we have no superknob on the EQ Racks.
This will override the Effect defaults of the effects with a superknob binding.
The force parameter is a quick effect only thing.