fix(layout): IE10-IE11 column-flex bug fix

Closes #8161

Author: Nickproger

src/core/style/layout.scss

@@ -410,3 +410,9 @@
     @include flex-properties-for-name($name);
     @include layout-for-name($name);
 }
+
+/* IE10-IE11 column-flex bug fix (set proper default value) */
+.layout-column > .flex {
+	-ms-flex-basis: auto;
+	flex-basis: auto;
+}