Add Configure Option to expand moddedAppId List

## Feature Description

Allow Users to extend the list of moddedAppId in https://github.com/AvengeMedia/DankMaterialShell/blob/02dd19962f8ed1c433d2f144d6dd67254c5950cc/quickshell/Common/Paths.qml#L48

## Use Case

i have some apps that dont show app icons, one of them is ts3_client and i would like to see an icon :)
The Problem coms from the App ID: "TeamSpeak 3" while the icon file is named "teamspeak3.svg" in some Themes only "teamspeak.svg" i would also like to use icons for my steam games instead of the fallback controller icon.

## Compositor

Is this feature specific to one compositor?

- [x] All compositors
- [ ] niri
- [ ] Hyprland
- [ ] dwl (MangoWC)
- [ ] sway

## Proposed Solution

Add an option for this in the workspace settings widget.
Also, the Running Apps widget uses a fallback icon with the first letter of the App ID (e.g., “T”). Having a similar fallback in the workspace switcher would be nice.

Here is a screenshot of the fallback: on the left side, the 3rd pill shows the "workspace switcher" with the “empty” TeamSpeak icon, while "Running Apps" shows “T”.

## Alternatives/Existing Solutions

--