INVOKE-RESTART-INTERACTIVELY behaves like INVOKE-RESTART w.r.t. test-function

INVOKE-RESTART-INTERACTIVELY behaves like INVOKE-RESTART w.r.t. test-function

* INVOKE-RESTART-INTERACTIVELY no longer consults the restart's
  test-function when called with a RESTART instance, fixing interactive
  invocation of restarts with test-functions e.g. from the debugger.

* Tests have been added in tests/condition.impure.lisp.

* Note that this change amends commit 69e6aef which fixed bug 774410
  with the following change to INVOKE-RESTART:

  > INVOKE-RESTART is also affected by the changes for bug
  > 774410. However, it does not respect restart test functions when
  > called with a RESTART instance (This is underspecified in CLHS and
  > other implementations behave in various ways. However, behaving
  > differently would make some restarts un-invokable).

  commit 69e6aef should have changed INVOKE-RESTART-INTERACTIVELY in the
  same way.

Reported-by: Vivitron in #sbcl