UI Enhancements (#1824)

* Fix button color

* Unify search icon

* Update select button colors

* Modify tap to hide for balance card

* Modify tap to hide constants

* Modify hidden balance behaviour

* Add tap to hide to second value

* Make tap to hide persistent

* Change to switchBalanceValue function

* Fix MWEB card spacing [skip ci]

* Swap buttons on wallets screen [skip ci]

lib/src/screens/receive/widgets/header_tile.dart

@@ -31,7 +31,7 @@ class _HeaderTileState extends State<HeaderTile> {
 
   @override
   Widget build(BuildContext context) {
-    final searchIcon = Image.asset("assets/images/search_icon.png",
+    final searchIcon = Icon( Icons.search,
         color: Theme.of(context).extension<ReceivePageTheme>()!.iconsColor);
 
     return Container(