Don't include query string in embedded grid URL.

This was causing the param list to grow each time a search happened at
least, maybe more.

tailbone/grids/core.py

@@ -88,7 +88,7 @@ class Grid(Object):
             classes.append('hoverable')
         return format_attrs(
             class_=' '.join(classes),
-            url=self.request.current_route_url())
+            url=self.request.current_route_url(_query=None))
 
     def get_view_url(self, row):
         kwargs = {}