Issue #3491922: Fixing main region width on Product edit pages

Removing constant width addition from main region class to eliminate issue with main region on Product edit page that overlaps right sidebar

Closes #3491922

css/commerce.admin-layout.css

@@ -44,13 +44,6 @@
     width: var(--commerce-layout-content-width);
   }
 
-  /* When the layout has vertical tabs */
-  .layout-region--commerce-main:has(.vertical-tabs),
-  .layout-region--commerce-main:has(.vertical-tabs)
-    ~ .layout-region--commerce-footer {
-    width: calc(var(--commerce-layout-content-width) + 8rem);
-  }
-
   /* Push sidebar down to horizontal align with form section. */
   .layout-region--commerce-secondary {
     grid-row: span 2;