fix(issuer): tiered sto price input

Author: BilalAlGhazi

packages/polymath-issuer/src/pages/sto/components/ConfigureSTOForm/forms/USDTieredSTO/InvestmentTiers.js

@@ -239,7 +239,6 @@ export default class InvestmentTiers extends React.Component<Props, State> {
                 <FormItem.Input
                   FormikComponent={Field}
                   component={NumberInput}
-                  min={0.01}
                   maxDecimals={2}
                   placeholder="Enter amount"
                   unit="USD"