fix(remote): assure only repository configuration

Previously it was possible for it to pick up non-repository
branch configuration, even though it was unlikely.

Closes gitpython-developers#350

Author: Byron

git/remote.py

@@ -388,7 +388,7 @@ def _set_cache_(self, attr):
         if attr == "_config_reader":
             # NOTE: This is cached as __getattr__ is overridden to return remote config values implicitly, such as
             # in print(r.pushurl)
-            self._config_reader = SectionConstraint(self.repo.config_reader(), self._config_section_name())
+            self._config_reader = SectionConstraint(self.repo.config_reader("repository"), self._config_section_name())
         else:
             super(Remote, self)._set_cache_(attr)