Bug 1756303 - Set tests for bug 1682686 to have layout.css.grid-item-baxis-measurement.enabled set as true. r=dholbert DONTBUILD

Bug 1682686 added the tests which need
layout.css.grid-item-baxis-measurement.enabled to be set to `true` independent
of the release channel.

Differential Revision: https://phabricator.services.mozilla.com/D139410

layout/generic/crashtests/crashtests.list

@@ -791,8 +791,8 @@ HTTP load 1677518-1.html
 load 1679794.html
 load 1680406.html
 load 1681788.html
-load 1682686-1.html
-load 1682686-2.html
+pref(layout.css.grid-item-baxis-measurement.enabled,true) load 1682686-1.html
+pref(layout.css.grid-item-baxis-measurement.enabled,true) load 1682686-2.html
 HTTP load 1682882.html
 load 1683126.html
 load 1697262-1.html