Don't throw when sent non-int limit/offset

This middleware shouldn't throw exceptions when `limit` or `offset`
query parametesr aren't integers.

src/metabase/server/middleware/offset_paging.clj

@@ -21,9 +21,9 @@
   (or page limit offset))
 
 (defn- parse-paging-params [{{:strs [limit offset]} :query-params}]
-  (let [limit  (or (some-> limit Integer/parseUnsignedInt)
+  (let [limit  (or (some-> limit parse-long)
                    default-limit)
-        offset (or (some-> offset Integer/parseUnsignedInt)
+        offset (or (some-> offset parse-long)
                    default-offset)]
     {:limit limit, :offset offset}))