[Dashboard] Fix airdrop erc20 scroll issue (#4909)

## Problem solved

Short description of the bug fixed or feature added

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## PR-Codex overview
This PR focuses on modifying the `className` of the `SheetContent` component in the `airdrop-button.tsx` file to improve its styling by adding an `overflow-y-auto` class, allowing for vertical scrolling if the content exceeds the available space.

### Detailed summary
- Updated the `className` of the `SheetContent` component:
  - Added `overflow-y-auto` to enable vertical scrolling.

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Author: kien-ngo

apps/dashboard/src/contract-ui/tabs/tokens/components/airdrop-button.tsx

@@ -41,7 +41,7 @@ export const TokenAirdropButton: React.FC<TokenAirdropButtonProps> = ({
           Airdrop
         </Button>
       </SheetTrigger>
-      <SheetContent className="z-[10000] sm:w-[540px] sm:max-w-[90%] lg:w-[700px]">
+      <SheetContent className="z-[10000] overflow-y-auto sm:w-[540px] sm:max-w-[90%] lg:w-[700px]">
         <SheetHeader>
           <SheetTitle>Aidrop tokens</SheetTitle>
         </SheetHeader>