Revert "Use arg length in coerce if it is a sequence."

This reverts commit 97b52407.

ticdesk_cmsstuff/templatetags/coerce.py

-import collections
-
 from django import template
 
 register = template.Library()
 
 @register.filter
 def coerce_max(value, arg):
-    if isinstance(arg, collections.Sequence):
-        arg = len(arg)
-
     return arg if value > arg else value
 
 @register.filter
 def coerce_min(value, arg):
-    if isinstance(arg, collections.Sequence):
-        arg = len(arg)
-
     return arg if value < arg else value