www/firefox: backport privacy.resistFingerprinting fix for User-Agent
If users are going to "pkg lock" due to addons better pretend to be an
ESR on the off chance JS malware is stupid enough to only check
User-Agent to filter out non-vulnerable Firefox versions.
Obtained from: upstream (Firefox 57)
MFH: 2017Q4
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head/www/firefox/Makefile