This PR fixes #5687

The issue was that if an encoding profile had a suffix starting with a '-' e.g. -presentation-3q-300k-25fps.mp4, workspace.toSafeName would change the first character to '_' e.g. _presentation-3q-300k-25fps.mp4, and the track would never be tagged with the profile name. This fix just adds a dummy character as the first one before toSafeName is called so that the 'suffix' is treated as a suffix, independently of the regex used.

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