pkg: -test shouldn't require a list of paths

Changes the test command to check if args contains a single path and
wraps it in a list. Now a test thread can be started without providing
a list:

  -test %/tests/lib

And passing a list still works:

  test %/tests/lib ~

One nit in this change is the lark expression to reach into args: if
args is ~ then instead of getting a useful need/have error, the test
ends in a "false-start". Perhaps this could be fixed by detecting ~
and setting it to %/tests.

pkg/arvo/ted/test.hoon

@@ -109,6 +109,10 @@
 =/  m  (strand ,vase)
 ^-  form:m
 =/  paz=(list path)
+  :: promote path to ~[path] if needed
+  ::
+  ?@  +<.q.arg
+    [(tail !<([~ path] arg)) ~]
   (tail !<([~ (list path)] arg))
 =/  bez=(list beam)
   (turn paz |=(p=path ~|([%test-not-beam p] (need (de-beam p)))))