Fix sequence-of-sequence

[andrewdavidmackenzie]

Running unittests examples/sequence-of-sequences/main.rs (target/debug/examples/sequence_of_sequences-a3af467001d40550)

running 1 test
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test test::test_sequence_of_sequences_example ... FAILED

failures:

---- test::test_sequence_of_sequences_example stdout ----

	Running example: flowr/examples/sequence-of-sequences
		Runner: flowrcli
		STDIN is read from test.stdin
		Arguments are read from test.args
		STDOUT is saved in test.stdout
		STDERR is saved in test.stderr
		File output is saved in test.file
	Command line: 'flowrcli --native manifest.json'
thread 'test::test_sequence_of_sequences_example' panicked at flowr/utilities/src/lib.rs:186:9:
Contents of 'flowr/examples/sequence-of-sequences/test.stdout' doesn't match the expected contents in 'flowr/examples/sequence-of-sequences/expected.stdout'
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    test::test_sequence_of_sequences_example

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.09s

error: test failed, to rerun pass `-p flowr --example sequence-of-sequences`
Error: The process '/home/runner/.cargo/bin/cargo' failed with exit code 101