refactor(token-bottom-sheet): remove unused generic

[satish-ravi]

Description

This was added in #4242 when we were working towards multichain, but now there shouldn't be a need for multiple TokenBalance types

Test plan

CI

Related issues

N/A

Backwards compatibility

Yes

Network scalability

If a new NetworkId and/or Network are added in the future, the changes in this PR will:

• Continue to work without code changes, OR trigger a compilation error (guaranteeing we find it when a new network is added)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.39%. Comparing base (a012a8d) to head (2b742e9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5484      +/-   ##
==========================================
- Coverage   86.40%   86.39%   -0.01%     
==========================================
  Files         761      761              
  Lines       31359    31359              
  Branches     5389     5389              
==========================================
- Hits        27097    27094       -3     
- Misses       4031     4034       +3     
  Partials      231      231              

Files	Coverage Δ
src/components/TokenBottomSheet.tsx	95.41% <100.00%> (ø)

... and 1 file with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a012a8d...2b742e9. Read the comment docs.