Some issues with the scrolling of the left side menu on mobile.

[PermaFreez]

Describe the bug
When the user opens the left side menu in the Web UI on Android they might encounter some strange behavior:

• If having no playlists one can see just the top of the "Users" option (granted they have admin privilege) however they can't scroll down to it.
• If having at least one playlist it becomes possible to scroll down in the menu, however not as far down as the "Users" button, which seems to not be there at all.

To reproduce

1. Open Koel from an Android browser, from an admin account.
2. Open the left side menu with the hamburger button.
3. Attempt to scroll down.
   4.1. If having playlists (or probably extra menu options) the list just ends at "Upload". On Brave Browser (having some of it's controls near the bottom of the screen) it ends at "Settings".
   4.2. If having no playlists (nor extra menu options) the top of "Users" can be seen and clicked on, however you can't scroll down to it.

Expected behavior
Being able to scroll down to the bottom of the list (the "Users" button) on an admin account.

Screenshots - Both taken when scrolled to the available bottom of the list

Environment

• Koel version v6.5.2
• OS: Android 11
• Browser Firefox 104.1.0 and Brave 1.44.114
• PHP version 8.1.11
• Node version 8.19.2

Additional context
Brave was acting just a little different, I think because it's control scheme takes up more vertical space than Firefox's do. This probably means that the way the bug is seen is dependent on the screen ratio, which is for my phone 9:19.

[phanan]

PR welcome.