remove zip benchmark that was helpful during development

We don't currently have a benchmark for this "zip" behavior of △, but
modifying the existing local benchmark would invalidate the trends for
that benchmark.

qi-sdk/benchmarks/local/benchmarks.rkt

@@ -178,19 +178,6 @@ for the forms are run.
                    check-values
                    300000)))
 
-(module zip "base.rkt"
-  (provide run)
-
-  (define (~zip . vs)
-    (apply
-     (☯ (△ +))
-     vs))
-
-  (define (run)
-    (run-benchmark ~zip
-                   check-list-values
-                   50000)))
-
 (module ground "base.rkt"
   (provide run)
 
@@ -926,7 +913,6 @@ for the forms are run.
    (prefix-in relay: (submod ".." relay))
    (prefix-in relay*: (submod ".." relay*))
    (prefix-in amp: (submod ".." amp))
-   (prefix-in zip: (submod ".." zip))
    (prefix-in ground: (submod ".." ground))
    (prefix-in thread: (submod ".." thread))
    (prefix-in thread-right: (submod ".." thread-right))
@@ -997,7 +983,6 @@ for the forms are run.
      "relay" relay:run
      "relay*" relay*:run
      "amp" amp:run
-     "zip" zip:run
      "ground" ground:run
      "thread" thread:run
      "thread-right" thread-right:run