Show icon previews in icon pickers

Settings.py

@@ -181,7 +181,10 @@ def BuildSettingsDialog(
 
             IconDropdown = ft.Dropdown(
                 value=BandData["Icon"],
-                options=[ft.DropdownOption(key=Name, text=_FolderIconLabel(Name)) for Name in FolderIconChoices],
+                options=[
+                    ft.DropdownOption(key=Name, text=_FolderIconLabel(Name), leading_icon=getattr(ft.Icons, Name))
+                    for Name in FolderIconChoices
+                ],
                 width=150,
             )
             ImageField = ft.TextField(value=BandData["ImagePath"], label="Or custom image path", expand=True)