ISTWMCS-6283: make image proportion fix apply to all images, not just sized ones.

src/patterns/01-core/elements/_img.scss

@@ -3,6 +3,8 @@
 
 :where(img) {
   max-inline-size: 100%;
+  /* Ensure images maintain proportions despite having dimensions set. */
+  height: auto;
   @media print {
     max-width: 100% !important;
     page-break-inside: avoid;

src/patterns/04-components/image/_image.scss

@@ -16,10 +16,6 @@
       display: table-caption;
     }
     &__sized-image {
-      /* Ensure sized images maintain proportions despite having dimensions set. */
-      img {
-        height: auto;
-      }
       &--center {
         align-self: center;
         img {