www/firefox: unbreak fetch

See https://bugzilla.mozilla.org/show_bug.cgi?id=1432591#c22

• mozilla-release-3db9e3d52b17563efca181ccbb50deb8660c59ae.old/.hg_archival.txt 2018-03-15 22:12:05 UTC

+++ mozilla-release-3db9e3d52b17563efca181ccbb50deb8660c59ae/.hg_archival.txt 2018-03-15 22:12:05 UTC
@@ -1,7 +1,5 @@
repo: 8ba995b74e18334ab3707f27e9eb8f4e37ba3d29
node: 3db9e3d52b17563efca181ccbb50deb8660c59ae
branch: default
-latesttag: FENNEC_59_0_BUILD3
-latesttag: FENNEC_59_0_RELEASE
-latesttagdistance: 5
-changessincelatesttag: 5
+tag: FIREFOX_59_0_1_BUILD1
+tag: FIREFOX_59_0_1_RELEASE

Reported by: Andrzej Tobola