Moving the CSS variable to the host

Author: rugoncalves

core/src/components/row/row.scss

@@ -2,11 +2,9 @@
 
 // Row
 // --------------------------------------------------
-:root {
+:host {
   --ion-col-gap: 0px;
-}
 
-:host {
   display: flex;
 
   flex-wrap: wrap;