Request for ERC20 approvals to be displayed in decimal rather than hex

[plasmacorral]

When signing a spending approval on an ERC20, the details tab will represent the approval amount in hex. This could be more clear for users if this value was displayed in decimal.

In the attached screenshot, I submitted and approval for 1.2345 on a 4 decimal ERC20 that I had deployed on a testnet. However, in firmware 1.2.4 on hardware v3 this value was shown as 3039.

Reproduction steps:

1. Setup Keystone v3
2. Bind to MetaMask (v11.7.2 tested with Chrome 117.0.5938.92)
3. Select Keystone address as active
4. Be on testnet
5. Go to test dapp
6. Connect
7. Scroll down to Send tokens section and tap CREATE TOKEN
8. Once confirmed, Add it to wallet with ADD TOKEN(S) TO WALLET
9. tap APPROVE TOKENS cta in test dapp
10. edit the amount if you chose
11. Tap Next in MetaMask
12. Tap Approve in MetaMask
13. Open MetaMask again bc open issue
14. Scan QR with Keystone
15. Tap details tab and scroll down