Bug 1308636 Part 1 - Convert -moz-column-span to column-span in a crashtest. r=dbaron

-moz-column-span missed the conversion in Bug 1308587 Part 2.
https://hg.mozilla.org/mozilla-central/rev/bb59a0c37162

Differential Revision: https://phabricator.services.mozilla.com/D59562

--HG--
extra : moz-landing-system : lando

netwerk/test/crashtests/785753-1.html

@@ -45,7 +45,7 @@ try{test0.style.setProperty('overflow-x','no-content','important');}catch(e){}
 },0);
 
 setTimeout(function(){
-try{styleSheet0.insertRule(".undefined,.undefined{font-size:40px; overflow-x:no-content; -moz-transition-duration:-5.408991568721831s; -moz-column-span:483; }",styleSheet0.cssRules.length);}catch(e){}
+try{styleSheet0.insertRule(".undefined,.undefined{font-size:40px; overflow-x:no-content; -moz-transition-duration:-5.408991568721831s; column-span:483; }",styleSheet0.cssRules.length);}catch(e){}
 try{test0.remove()}catch(e){};
 try{test0.insertBefore(test2);}catch(e){}
 try{test3.style.setProperty('bottom','inherit','important');}catch(e){}