Update langpacks URL

Building project firefox-langpacks - firefox-langpacks-102.4.0esr-build1-linux-i686-1d660d
File SHA512SUMS-102.4.0esr-build1 is signed with id 14F26682D0916CDD81E37B6D61B7B526D98F0353
Using file /home/piero/Tor/tor-browser-build/out/firefox-langpacks/SHA512SUMS-102.4.0esr-build1
--2022-10-28 13:54:31--  https://ftp.mozilla.org/pub/mozilla.org/firefox/candidates/102.4.0esr-candidates/build1/linux-i686/xpi/ar.xpi
Resolving ftp.mozilla.org (ftp.mozilla.org)... 34.104.33.0
Connecting to ftp.mozilla.org (ftp.mozilla.org)|34.104.33.0|:443... connected.
HTTP request sent, awaiting response... 502 Bad Gateway
2022-10-28 13:54:37 ERROR 502: Bad Gateway.

Error: Error creating dl-langpack-linux-i686-102.4.0esr-build1

Changing from /pub/mozilla.org/firefox/candidates/... to /pub/firefox/candidates/... solves the problem.

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