Issue #3115005 by bnjmnm: Remove fieldset CSS that was only there to work...

Issue #3115005 by bnjmnm: Remove fieldset CSS that was only there to work around a now-fixed Firefox bug

(cherry picked from commit c81afb88)

core/themes/bartik/css/components/form.css

@@ -36,17 +36,6 @@ fieldset {
   padding: 0.35em 0.625em 0.75em; /* 1 */
   border: 1px solid #c0c0c0; /* 1 */
 }
-/**
- * We've temporarily added this Firefox specific rule here to fix fieldset
- * widths.
- * @todo remove once this Mozilla bug is fixed.
- * See https://bugzilla.mozilla.org/show_bug.cgi?id=504622
- */
-@media (min--moz-device-pixel-ratio: 0) {
-  fieldset {
-    display: table-cell;
-  }
-}
 details,
 fieldset,
 .filter-wrapper {

core/themes/seven/css/components/form.css

@@ -45,17 +45,6 @@ fieldset:not(.fieldgroup) {
   border-radius: 2px;
   background-color: #fcfcfa;
 }
-/**
- * We've temporarily added this Firefox specific rule here to fix fieldset
- * widths.
- * @todo remove once this Mozilla bug is fixed.
- * See https://bugzilla.mozilla.org/show_bug.cgi?id=504622
- */
-@media (min--moz-device-pixel-ratio: 0) {
-  fieldset:not(.fieldgroup) {
-    display: table-cell;
-  }
-}
 fieldset:not(.fieldgroup) > legend {
   position: absolute;
   top: 10px;
@@ -67,17 +56,6 @@ fieldset:not(.fieldgroup) > legend {
 .fieldgroup {
   min-width: 0;
 }
-/**
- * We've temporarily added this Firefox specific rule here to fix fieldset
- * widths.
- * @todo remove once this Mozilla bug is fixed.
- * See https://bugzilla.mozilla.org/show_bug.cgi?id=504622
- */
-@media (min--moz-device-pixel-ratio: 0) {
-  .fieldgroup {
-    display: table-cell;
-  }
-}
 .form-item {
   margin: 0.75em 0;
 }