Fix the min >= start and max <= end case (WIP)

This fixes the 'should get bins with min >= start and max <= end' test
case but probably breaks a number of other cases (those with no start
and/or no end).

lib/cartodb/models/dataview/histograms/numeric-histogram.js

@@ -135,7 +135,7 @@ SELECT
     END AS bin
 FROM
 (
-    ${ctx.query}
+    SELECT * FROM (${ctx.query}) __ctx_query WHERE ${ctx.column} >= ${ctx.start} AND  ${ctx.column} <= ${ctx.end}
 ) __cdb_filtered_source_query${extra_tables}
 GROUP BY 10${extra_groupby}
 ORDER BY 10;`;