remove remnants of config SSL options

follow-up 012ce1c1bb

electrum/commands.py

@@ -329,12 +329,6 @@ class Commands:
         self.config.set_key(key, value)
         return True
 
-    @command('')
-    async def get_ssl_domain(self):
-        """Check and return the SSL domain set in ssl_keyfile and ssl_certfile
-        """
-        return self.config.get_ssl_domain()
-
     @command('')
     async def make_seed(self, nbits=None, language=None, seed_type=None):
         """Create a seed"""