[Glitch] Fix missing border on error screen in light theme in web UI

Port d1a9f601c7 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles/mastodon-light/diff.scss

@@ -24,13 +24,16 @@ html {
 .column > .scrollable,
 .getting-started,
 .column-inline-form,
-.error-column,
 .regeneration-indicator {
   background: $white;
   border: 1px solid lighten($ui-base-color, 8%);
   border-top: 0;
 }
 
+.error-column {
+  border: 1px solid lighten($ui-base-color, 8%);
+}
+
 .column > .scrollable.about {
   border-top: 1px solid lighten($ui-base-color, 8%);
 }