follow-up prev

kivy infers the type of the property from the default value.
without this, it was converting the str(Decimal(x)) to float

electrum/gui/kivy/uix/dialogs/lightning_channels.py

@@ -230,7 +230,7 @@ Builder.load_string(r'''
     remote_ctn:0
     local_csv:0
     remote_csv:0
-    feerate:0
+    feerate:''
     can_send:''
     can_receive:''
     is_open:False