Change zIndex for toast component

Let's set the toast to be in front of the component drawer to avoid confusion.

dapp/src/theme/utils/zIndices.ts

@@ -1,5 +1,5 @@
 export const zIndices = {
   sidebar: 1450,
   drawer: 1470,
-  toast: 1410,
+  toast: 1480,
 }