fix: destructure decimal part in TokenAmountField isAllowed validator

The isAllowed callback was destructuring index 0 from split('.'),
which is the integer part, not the decimal part. This caused the
validation to compare token decimals against the integer digit count
instead of the actual decimal digit count.

Author: gabitoesmiapodo

src/components/sharedComponents/TokenInput/index.tsx

@@ -228,7 +228,7 @@ function TokenAmountField({
   const { onChange, inputRef, ...restProps } = renderInputProps
 
   const isAllowed = ({ value }: NumberFormatValues) => {
-    const [inputDecimals] = value.toString().split('.')
+    const [, inputDecimals] = value.toString().split('.')
 
     if (!inputDecimals) {
       return true