git-svn: branch: avoid systematic prompt for cert/pass

Commands such as "git svn init/fetch/dcommit" do not prompt for client
certificate/password if they are stored in SVN config file.  Make
"git svn branch" consistent with the other commands, as SVN::Client is
capable of building its own authentication baton from information in the
SVN config directory.

Signed-off-by: Monard Vong <travelingsoul86@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>

git-svn.perl

@@ -1161,7 +1161,9 @@ sub cmd_branch {
 	::_req_svn();
 
 	my $ctx = SVN::Client->new(
-		auth    => Git::SVN::Ra::_auth_providers(),
+		config => SVN::Core::config_get_config(
+			$Git::SVN::Ra::config_dir
+		),
 		log_msg => sub {
 			${ $_[0] } = defined $_message
 				? $_message