[ASSET-43] Update BTCB image

[jormal]

Pull Request

Description

BTCB의 image와 native BTC의 image를 구분하기 위해 BTCB의 image를 갱신합니다.

Related issue: ASSET-43

Changes

• e26951d: Symbol image 갱신

Types of Changes (multiple options can be selected)

• Create asset information
• Update asset information
• Delete asset information
• Other {{Please add description here}}

Checklist

• Did you pass the tests? (Did you execute pytest -l in your PC and get a green light?)
• Did you run the pre-process?
• Have you added and run tests to validate the changes?
• Have you updated the documentation?
• Have you updated the version in {PWD}/VERSION if you need?