Bug 1447345 - Change enterprise policy that sets homepage to set it as the default rather than the user value for the pref r=Felipe

Additionally removes a stray debugging line that I accidentally checked into the tree previously.

MozReview-Commit-ID: 7F2S8WBgKCj

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extra : rebase_source : e25e343f3e8f57a52678c65ded973bb91d73d90a