Update dependencies for mozrunner (0.4) and mozprofile (0.3) to
stop setting default preferences by mozrunner. This will also allow
to overwrite all preferences now via the moz:firefoxOptions capability.

MozReview-Commit-ID: IU0oKzRnnfG

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extra : rebase_source : 7f8946f7e22af9beebaddc52c78d549ddc898c87