url: remove test for self.ui in BetterHTTPS

We use self.ui unconditionally anyway so we would have noticed if it in some
cases wasn't set.

mercurial/url.py

@@ -546,12 +546,9 if has_https:
         send = keepalive.safesend
 
         def connect(self):
-            if hasattr(self, 'ui'):
                 cacerts = self.ui.config('web', 'cacerts')
                 if cacerts:
                     cacerts = util.expandpath(cacerts)
-            else:
-                cacerts = None
 
             hostfingerprint = self.ui.config('hostfingerprints', self.host)
             if cacerts and not hostfingerprint: