correct slider default value is cutoff value is "minimal value"

cf #67


Former-commit-id: 76ab2801d1fe8455d132d103d8ec635c3249c9ce

ippisite/ippidb/views.py

@@ -146,8 +146,10 @@ def process_cutoff_value(name, context, request, cutoff_dir='l'):
         context[name] = request.GET.get(name)
         filter_dict = {name + '__' + cutoff_dir + 'te': context[name]}
         context['compounds'] = context['compounds'].filter(**filter_dict)
-    else:
+    elif cutoff_dir == 'l':
         context[name] = context[name+'_max']
+    else:
+        context[name] = context[name+'_min']
     return context
 
 def compound_list(request):