Appearance setting for show/hide scroll bar on chat window

[shatfield4]

Pull Request Type

• ✨ feat
• 🐛 fix
• ♻️ refactor
• 💄 style
• 🔨 chore
• 📝 docs

Relevant Issues

resolves #2153

What is in this change?

• Implement a new setting for showing and hiding the scroll bar on the main chat window
• Helps tablet users be able to navigate the chat window easier so they can use a stylus or their finger to scroll up and down in chats
• Store as localstorage option instead of using db

Additional Information

Developer Validations

• I ran yarn lint from the root of the repo & committed changes
• Relevant documentation has been updated
• I have tested my code functionality
• Docker build succeeds locally