Remove forms dependency on 'extras'

Author: adamchainz

leaflet/__init__.py

@@ -91,7 +91,6 @@
 # Add plugins required for forms (not auto-included)
 # Assets will be preprended to any existing entry in PLUGINS['forms']
 _forms_js = ['leaflet/draw/leaflet.draw.js',
-             'leaflet/leaflet.extras.js',
              'leaflet/leaflet.forms.js']
 if SRID:
     _forms_js += ['leaflet/proj4.js',