ISTWCMS-5648: fixing layout uw col 1

src/patterns/03-layouts/layout/layout--1-col/_layout--1-col.scss

 .layout--uw-1-col {
-  display: var(--grid-gap);
+  display: grid;
+  gap: var(--grid-gap);
   grid-template-columns: 100%;
 }
 
+
 .layout--uw-1-col .layout__region--first {
   grid-column: 1 / 2;
 }