Allow spaces and dashes in the two factor code

I noticed when using the dication software that saying ‘one two three
four five’ got dictated as `123 45`. This tripped the validation,
because the space character isn’t a digit.

So this commit normalises out spaces (and other spacing characters like
dashes and underscores) before validating the code and sending it to the
API.

I can also imagine that some people might like to space out the code to
make it easier to transcribe (like you might do with a credit card
number).

app/main/forms.py

@@ -177,6 +177,10 @@ class SMSCode(StringField):
     def __call__(self, **kwargs):
         return super().__call__(type='tel', pattern='[0-9]*', **kwargs)
 
+    def process_formdata(self, valuelist):
+        if valuelist:
+            self.data = Columns.make_key(valuelist[0])
+
 
 class ForgivingIntegerField(StringField):