Makes Character Selection Modal constant size

[BobinChen1]

Describe your changes

Makes Character Selection Modal height based on view height and makes filters always stay visible while scrolling

Issue or discord link

N/A

Testing/validation

Checklist before requesting a review (leave this PR as draft if any part of this list is not done.)

• I have commented my code in hard-to understand areas.
• I have made corresponding changes to README or wiki.
• For front-end changes, I have updated the corresponding English translations.
• I have run yarn run mini-ci locally to validate format and lint.
• If I have added a new library or app, I have updated the deployment scripts to ignore changes as needed

[github-actions]

[frontend] [Fri Apr 19 14:56:21 UTC 2024] - Deployed 4cc0db9 to https://genshin-optimizer-prs.github.io/pr/1994/frontend (Takes 3-5 minutes after this completes to be available)

[frontend] [Fri Apr 19 15:23:23 UTC 2024] - Deployed bb6c182 to https://genshin-optimizer-prs.github.io/pr/1994/frontend (Takes 3-5 minutes after this completes to be available)

[frontend] [Fri Apr 19 15:23:33 UTC 2024] - Deployed 6630541 to https://genshin-optimizer-prs.github.io/pr/1994/frontend (Takes 3-5 minutes after this completes to be available)

[frontend] [Sat Apr 20 15:25:58 UTC 2024] - Deployed f29b5a4 to https://genshin-optimizer-prs.github.io/pr/1994/frontend (Takes 3-5 minutes after this completes to be available)

[Sun Apr 21 04:38:08 UTC 2024] - Deleted deployment

[nguyentvan7]

A little cramped on mobile, but still seems fine to me