Remove unused imports

lua/playlist_browser.lua

@@ -4,17 +4,12 @@
 
 local lvgl = require("lvgl")
 local widgets = require("widgets")
-local database = require("database")
-local sd_card = require("sd_card")
 local backstack = require("backstack")
-local browser = require("browser")
 local playing = require("playing")
-local styles = require("styles")
 local filesystem = require("filesystem")
 local screen = require("screen")
 local font = require("font")
 local theme = require("theme")
-local img = require("images")
 local playback = require("playback")
 local queue = require("queue")
 local table_iterator = require("table_iterator")