Bug 1698827 - Use border-spacing: 0; on about:crashes tables. r=gsvelto

Differential Revision: https://phabricator.services.mozilla.com/D108776

toolkit/crashreporter/content/crashes.css

@@ -18,7 +18,7 @@
 table {
   width: 100%;
   padding-bottom: 2em;
-  border-collapse: collapse;
+  border-spacing: 0;
 }
 
 th {