www/firefox-esr-i18n: unbreak fetch after r478507

> ach.xpi doesn't seem to exist in /portdistfiles/xpi/firefox-60.2.0.

> Attempting to fetch https://download.cdn.mozilla.net/pub/firefox/releases/60.2.0esr/linux-i686/xpi/ach.xpi

fetch: https://download.cdn.mozilla.net/pub/firefox/releases/60.2.0esr/linux-i686/xpi/ach.xpi: Not Found

> Attempting to fetch https://archive.mozilla.org/pub/firefox/releases/60.2.0esr/linux-i686/xpi/ach.xpi

fetch: https://archive.mozilla.org/pub/firefox/releases/60.2.0esr/linux-i686/xpi/ach.xpi: Not Found

> Attempting to fetch https://download.cdn.mozilla.net/pub/firefox/candidates/60.2.0esr-candidates/build2/linux-i686/xpi/ach.xpi

fetch: https://download.cdn.mozilla.net/pub/firefox/candidates/60.2.0esr-candidates/build2/linux-i686/xpi/ach.xpi: Not Found

> Attempting to fetch https://archive.mozilla.org/pub/firefox/candidates/60.2.0esr-candidates/build2/linux-i686/xpi/ach.xpi

fetch: https://archive.mozilla.org/pub/firefox/candidates/60.2.0esr-candidates/build2/linux-i686/xpi/ach.xpi: Not Found

> Attempting to fetch http://distcache.FreeBSD.org/ports-distfiles/xpi/firefox-60.2.0/ach.xpi

fetch: http://distcache.FreeBSD.org/ports-distfiles/xpi/firefox-60.2.0/ach.xpi: Not Found

> Couldn't fetch it - please try to retrieve this

> port manually into /portdistfiles/xpi/firefox-60.2.0 and try again.

• Error code 1

Reported by: pkg-fallout