[FIX] stock: remove state modifiers for field note in stock.picking

Remove the state modifiers for field note in stock.picking in order to have a
behavior which is consistent with sales orders or invoices.

opw-639956

addons/stock/stock.py

@@ -642,7 +642,7 @@ class stock_picking(osv.osv):
         'origin': fields.char('Source Document', size=64, states={'done':[('readonly', True)], 'cancel':[('readonly',True)]}, help="Reference of the document", select=True),
         'backorder_id': fields.many2one('stock.picking', 'Back Order of', states={'done':[('readonly', True)], 'cancel':[('readonly',True)]}, help="If this shipment was split, then this field links to the shipment which contains the already processed part.", select=True),
         'type': fields.selection([('out', 'Sending Goods'), ('in', 'Getting Goods'), ('internal', 'Internal')], 'Shipping Type', required=True, select=True, help="Shipping type specify, goods coming in or going out."),
-        'note': fields.text('Notes', states={'done':[('readonly', True)], 'cancel':[('readonly',True)]}),
+        'note': fields.text('Notes'),
         'stock_journal_id': fields.many2one('stock.journal','Stock Journal', select=True, states={'done':[('readonly', True)], 'cancel':[('readonly',True)]}),
         'location_id': fields.many2one('stock.location', 'Location', states={'done':[('readonly', True)], 'cancel':[('readonly',True)]}, help="Keep empty if you produce at the location where the finished products are needed." \
                 "Set a location if you produce at a fixed location. This can be a partner location " \