repolist: add owner-filter

This allows custom links to be used for repository owners by
configuring a filter to be applied in the "Owner" column in the
repository list.

shared.c

@@ -72,6 +72,7 @@ struct cgit_repo *cgit_add_repo(const char *url)
 	ret->commit_filter = ctx.cfg.commit_filter;
 	ret->source_filter = ctx.cfg.source_filter;
 	ret->email_filter = ctx.cfg.email_filter;
+	ret->owner_filter = ctx.cfg.owner_filter;
 	ret->clone_url = ctx.cfg.clone_url;
 	ret->submodules.strdup_strings = 1;
 	return ret;