Bug 1340561 - fix comment for the re-enabled svg crashtest. comment-only, no review, DONTBUILD

This test has been re-enabled for stylo in bug 1342596, but the comment
is somehow left.

MozReview-Commit-ID: BDbJGSCz8io

layout/svg/crashtests/crashtests.list

@@ -105,7 +105,7 @@ load 587336-1.html
 load 590291-1.svg
 load 601999-1.html
 load 605626-1.svg
-asserts(2) load 606914.xhtml # bug 606914, bug 1340561 tracks the stylo bit
+asserts(2) load 606914.xhtml # bug 606914
 load 610594-1.html
 load 610954-1.html
 load 612662-1.svg