fix remixd test

[bunsenstraat]

• when renamepath runs and one of the steps fails done() is never called this causes nightwatch to wait for a timeout after 10 minutes stalling the CI job
• same applies to spawnremixd, when it fails the script should end
• when the test fails the remixd files have changed, so a rerun of the test would fail too because the test files the test uses are changed and not found causing the test to always fail. so resetting head after running is necessary

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