fix test assertion of new test

Author: Christian Riedel

tests/test_add_jira_tag.py

@@ -138,4 +138,4 @@ class MockBranch:  # pylint: disable=too-few-public-methods, missing-class-docst
     mock_commit_msg_file.write_text("commit message 0815\n#TEST-123")
     result = cli_runner.invoke(main, ["--jira-tag=TEST", str(mock_commit_msg_file)])
     assert result.exit_code == 0
-    assert mock_commit_msg_file.read_text() == "TEST-123: commit message 0815\nTEST-123"
+    assert mock_commit_msg_file.read_text() == "TEST-123: commit message 0815\n#TEST-123"