[polybar] Update conf for compatibility with polybar 3.7.0

.config/polybar/modules.ini

@@ -1,6 +1,6 @@
 [module/windows]
 type = custom/text
-content ="  "
+label ="  "
 click-left = rofi -modi window -show window -theme $ROFI_THEME -show-icons -location 1 -yoffset +45 -xoffset +20
 
 [module/mpd]
@@ -98,13 +98,6 @@ type = custom/script
 exec = ~/.config/polybar/scripts/check_vpn
 interval = 5
 
-[module/spotify]
-type = custom/script
-exec = ~/.config/polybar/scripts/spotify.py
-interval = 5
-format-prefix = " "
-format-font = 1
-
 [module/date]
 type = internal/date
 interval = 1
@@ -187,3 +180,9 @@ exec = ~/.config/polybar/scripts/docker
 exec-if = docker ps -q
 interval = 10
 label = "%output%"
+
+[module/tray]
+type = internal/tray
+tray-maxsize = 40
+tray-background = ${root.background}
+tray-spacing = 7