Adding NFT from a different network just closes the add dialog instead of disabling it

[srirambv]

Description

Adding NFT from a different network just closes the add dialog instead of disabling it

Steps to reproduce

1. Set Network to Ethereum
2. Add an Ethereum NFT
3. Try to add a Polygon NFT in the same network
4. Add dialog closes but doesn't add the NFT
5. Change network to Polygon, no NFT is added

Actual result

Adding NFT from a different network just closes the add dialog instead of disabling it

Expected result

Should probably throw error if its not added

Issue reproduces how often

Easy

Version/Channel Information:

• Can you reproduce this issue with the current Play Store version? NA
• Can you reproduce this issue with the current Play Store Beta version? Yes
• Can you reproduce this issue with the current Play Store Nightly version? Not checked

Device details

• Install type (ARM, x86): ARM
• Device type (Phone, Tablet, Phablet): All
• Android version: All

Brave version

1.52.92

Website problems only

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards?NA
• Is the issue reproducible on the latest version of Chrome? NA

Additional information

cc: @simoarpe @kleantzogu @jamesmudgett