[Bug]: Could not make gas fee zero in the app. but in chrome extension its possible. we need the option for zero gas fee in the metamask app instead of 0.00001 default.

@AstraGuild commented on [Thu Sep 29 2022](https://github.com/MetaMask/metamask-extension/issues/16035)

### Describe the bug

In chrome you can make the gas price (GWEI) to zero. in the app it always make the zero into 0.00001. since we are developing a zero gas fee blockchain, can you adjust the app to accomodate our zero gas fee blockchain?

### Steps to reproduce
1. use the agvnetwork.org RPC for testing
Network Name :AGV Network Testnet
RPC URL :https://rpc-testnet.agvnetwork.org/rpc/
Chain Id :2833
Currency Symbol :AGV
Block explorer URL :https://testnet.agvnetwork.org/
2. get AGV toklen from the faucet at https://faucet.agvnetwork.org/
3. send native token to any address.
4. adjust Gas Prive (GWEI) to zero (0)
5. In Chrome extension, we can see that its possible to make it zero. which is good for us.
6. In Metamask app everytime you edit the gas price to zero (0) it will always set a default of 0.00001 which defeat the purpose of ou zero blockchain developement.

### Error messages or log output

```shell
In chrome you can make the gas price (GWEI) to zero. in the app it always make the zero into 0.00001. since we are developing a zero gas fee blockchain, can you adjust the app to accomodate our zero gas fee blockchain?
```

### Version

10.18.4

### Build type

_No response_

### Browser

Chrome

### Operating system

Windows

### Hardware wallet

_No response_

### Additional context

In chrome you can make the gas price (GWEI) to zero. in the app it always make the zero into 0.00001. since we are developing a zero gas fee blockchain, can you adjust the app to accomodate our zero gas fee blockchain?

No source file or test is named in the issue. Reproduce the behavior in the mobile app with the AGV Network Testnet RPC and compare it with the Chrome extension, focusing on editing the gas price to zero. Done means the app preserves a zero gas price for the provided network instead of replacing it with 0.00001.

Written by the indexing model from the issue text.