Don't restrict rl_externallink index to 50 #313

Job	Run time
call-mediawiki-tests-workflow (master, 8.1, 81, false, true) / master \| PHP 8.1	4m 6s
call-mediawiki-tests-workflow (REL1_42, 8.1, 81, true, false) / REL1_42 \| PHP 8.1	3m 52s
call-mediawiki-tests-workflow (REL1_43, 8.1, 81, false, true) / REL1_43 \| PHP 8.1	3m 57s
notify-irc	23s
	12m 18s

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