fix(tokens): lowercase tokens addresses in map to avoid duplicates

[shoom3301]

Summary

There are two fixes in this PR:

1. Used added tokens may contain tokens with mixedCased addresses and it causes token duplicates.

2. When the list of user-added tokens is too long, it goes out of the container.

The state file.

todo-1 (1).json

To Test

1. Open Dapp from this PR
2. Clean all browser data for this URL: Console -> Application -> Storage -> "Clear site data"
3. Copy the content of the file above and run in the console: var state = <PUT_THE_FILE_CONTENT>, press Enter
4. Run the code in the console: localStorage.clear(); var stateObj = JSON.parse(state); Object.keys(stateObj).forEach(key => localStorage.setItem(key, stateObj[key]))
5. Reload the page

• There is no alert with text "There is more than one token..."

6. Open user-added tokens list

• The list should be scrollable when there is no enough space for all tokens

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Name	Status	Preview	Updated (UTC)
swap-dev	✅ Ready (Inspect)	Visit Preview	Oct 30, 2023 6:19am

[alfetopito]

The copied localStorage did not work for me this time.
But I manually added a bunch of tokens and it worked fine.
Did not try the lower case vs checksummed address.

[anxolin]

👍