Fixes two bugs relating to custom certificates:
Fixes two bugs relating to custom certificates:

* Resetting to the default taskd server would set incorrect cert/key
  paths.
* Downloading certificates from the various endpoints would not be
  properly apprised of actual file path, and would 500.

coddingtonbear/inthe.am,coddingtonbear/inthe.am,coddingtonbear/inthe.am,coddingtonbear/inthe.am,coddingtonbear/inthe.am