Fix flake8 errors

opentech/public/projects/widgets.py

 import json
 
 from django import forms
-from django.utils.functional import LazyObject
 
 from opentech.apply.categories.models import Category
 
@@ -47,7 +46,6 @@ class CategoriesWidget(forms.MultiWidget):
         super().__init__(*args, **kwargs)
         self.widgets = LazyWidgets(OptionsWidget, Category)
 
-
     def decompress(self, value):
         data = json.loads(value)
         return [