Able to set slippage lower than "0.01%" on "Convert" page

[drptbl]

Description: User is able to set slippage lower than "0.01%" on Kwenta, for example "0.009%". On 1inch you're not able to set slippage lower than "0.01%" which makes me think it should work the same way on Kwenta.

Reproduction steps:

1. Go to Kwenta "Convert" page (https://dev.kwenta.io/dashboard/convert)
2. Connect your wallet
3. Set slippage to "0.009%"

Current behavior:

• User is able to set slippage lower than 0.01%.

Expected behavior:

• User shouldn't be able to set slippage lower than 0.01%.

Screenshots:

Desktop (please complete the following information):

• OS: macOS Big Sur 11.2.2
• Browser: Chrome 89.0.4389.95

[jcmonte]

fixed by #338