remove outdated eslint directive (#445)

No longer needed

modules/ext.managewiki.oouiform.tabs.js

@@ -87,11 +87,6 @@
 			var hash = location.hash;
 			if ( hash.match( /^#mw-[\w-]+/ ) ) {
 				detectHash();
-			/*
-			 * The next comment makes eslint ignore possible timing attacks when checking if the hash is an empty string
-			 * as this is not something you need a constant-time comparison for
-			*/
-			// eslint-disable-next-line security/detect-possible-timing-attacks
 			} else if ( hash === '' ) {
 				switchManageWikiTab( $( '[id*=mw-section-]' ).attr( 'id' ), true );
 			}