(minor) v2 - adding a custom token already in the list adds it a second time.

[0xMaka]

Steps to reproduce:

• Obtain token address of a token that is already in the list.
• Add it to your list

Actual result:

• Appears twice Expected result:
• Appears once similarly to v1

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Source URL: https://www.sushi.com/swap

Issue details: Open in Marker.io

Console: 📃 0 logs

Device type	desktop
Browser	Chrome 108.0.0.0
Screen Size	1680 x 1050
OS	Windows 10.0.0
Viewport Size	1298 x 736
Zoom Level	100%
Pixel Ratio	@​1x