Allow query package to depend on syncbase, but only for tests.

Also remove no-longer-existing package from dependency rules.

Change-Id: I6c904fe2c38abce77f724e1dd624a843adb4e9d4
diff --git a/query/.godepcop b/query/.godepcop
index 9f67558..12c954a 100644
--- a/query/.godepcop
+++ b/query/.godepcop
@@ -1,4 +1,4 @@
 <godepcop>
   <pkg deny="v.io/v23/syncbase"/>
-  <pkg deny="v.io/v23/syncbase/nosql"/>
+  <xtest allow="v.io/v23/syncbase"/>
 </godepcop>