repo: remove test which deletes HEAD

This is not something anybody would ever do; removing HEAD makes the
.git/ directory no longer be a repository, so we wouldn't be expected to
handle such a situation.

tests/repo/head.c

@@ -270,24 +270,3 @@ void test_repo_head__setting_head_updates_reflog(void)
 	git_object_free(tag);
 	git_signature_free(sig);
 }
-
-void test_repo_head__setting_creates_head_ref(void)
-{
-	git_reference *head;
-	git_reflog *log;
-	const git_reflog_entry *entry;
-
-	cl_git_pass(git_reference_lookup(&head, repo, "HEAD"));
-	cl_git_pass(git_reference_delete(head));
-	cl_git_pass(git_reflog_delete(repo, "HEAD"));
-
-	cl_git_pass(git_repository_set_head(repo, "refs/heads/haacked", NULL, "create HEAD"));
-
-	cl_git_pass(git_reflog_read(&log, repo, "HEAD"));
-	cl_assert_equal_i(1, git_reflog_entrycount(log));
-	entry = git_reflog_entry_byindex(log, 0);
-	cl_assert_equal_s("create HEAD", git_reflog_entry_message(entry));
-
-	git_reflog_free(log);
-	git_reference_free(head);
-}