Make swipe left and right work from any point of the view

I've noticed that it's really hard to get the user list or the server/channel list open with swipes because it requires you to start the swipe from the very edge of the screen.

Slack and Discord both allow you to start swiping from any part of the screen (to left or right) and it will slide open either the channel or user list.

This is a small UX improvement that would make Quasseldroid immensely easier to use one handed.