MC-14996: IE11 - Cannot Add/Move Content Types to Column If Appearance Is Not Full-Height

- force ie11 to recognize min-height values in flex item for appearances

Author: anthoula

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/column/_default.less

@@ -14,7 +14,7 @@
     > .element-children {
         flex: 1;
         max-width: 100%;
-        min-height: auto;
+        min-height: initial;
         padding: 0;
     }
 }