Apperance: Remove obsolete variables and a filter

Remove the variable multi_select_item_properties and the
get_encoded_parameter custom filter.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/common/templatetags/common_tags.py

@@ -29,14 +29,6 @@ def get_collections():
     return Collection.get_all()
 
 
-@register.filter
-def get_encoded_parameter(item, parameters_dict):
-    result = {}
-    for key, value in parameters_dict.items():
-        result[key] = resolve_attribute(obj=item, attribute=value)
-    return dumps(result)
-
-
 @register.filter
 def get_type(value):
     return force_text(type(value))