Add board selection to ban creation and post ID to ban model

* Board selection is allowed for when you want to make a global ban
* Post ID is added to ban model for referencing later

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/forms.py

@@ -88,13 +88,13 @@ class BanForm(ModelForm):
 
     class Meta:
         model = Ban
-        fields = ["ban_reason"]
+        fields = ["ban_reason", "board"]
 
     def __init__(self, *args, op, **kwargs):
         super(BanForm, self).__init__(*args, **kwargs)
         self.op = op
-        self.instance.board = op.board
         self.instance.ip = op.ip
+        self.instance.post_id = op.id
 
     def clean(self):
         super(BanForm, self).clean()