Fix breakout test failure on MySQL

The issue only shows up in Circle CI and appears to be related to
MySQL there returning java.lang.Float values instead of
doubles. Converting these to doubles (via round-to-decimals) before
comparing fixes the issue.

test/metabase/sync_database_test.clj

@@ -361,7 +361,8 @@
   (tt/with-temp* [Database [database {:details (:details (Database (id))), :engine :h2}]
                   Table    [table    {:db_id (u/get-id database), :name "VENUES"}]]
     (sync-table! table)
-    [(db/select-one-field :min_value Field, :id (id :venues :longitude))
-     (db/select-one-field :max_value Field, :id (id :venues :longitude))
-     (db/select-one-field :min_value Field, :id (id :venues :latitude))
-     (db/select-one-field :max_value Field, :id (id :venues :latitude))]))
+    (map #(u/round-to-decimals 4 %)
+         [(db/select-one-field :min_value Field, :id (id :venues :longitude))
+          (db/select-one-field :max_value Field, :id (id :venues :longitude))
+          (db/select-one-field :min_value Field, :id (id :venues :latitude))
+          (db/select-one-field :max_value Field, :id (id :venues :latitude))])))