DateTimeRangeInput fields names fixed.

Now filtering by time (hours and minutes) is applied correctly.

Author: Kyrylo Skriabin

lib/active_admin_datetimepicker/inputs/filters/date_time_range_input.rb

@@ -10,6 +10,14 @@ def input_html_options(input_name = gt_input_name)
             options[:class] = html_class
           end
         end
+
+        def gt_input_name
+          "#{method}_gteq"
+        end
+
+        def lt_input_name
+          "#{method}_lteq"
+        end
       end
     end
   end