[Error] Themes don't integrate (openSUSE Tumbleweed host/guest)

Neither Qt nor GTK themes installed on an openSUSE Tumbleweed host are available within a Tumbleweed container.

**To Reproduce**
1. `distrobox ephemeral`
2. Observe `Integrating host's themes, icons, fonts... [ OK ]`
3. Launch any GTK or Qt graphical application from inside the box (I tested Geany and KWrite)

**Expected behavior**
It looks good.

**Logs**
Unavailable, pending #757.

**Desktop (please complete the following information):**
- Are you using podman or docker?
- Which version or podman or docker?
- Which version of distrobox?

查看 distrobox 中的主題整合腳本，該腳本可能位於 /usr/share/distrobox 或原始碼儲存庫中。檢查主題如何從主機掛載或連結到容器中。在 Tumbleweed 容器內測試一個簡單的 GTK 或 Qt 應用程式，看看缺少什麼。修正 #757 後檢查日誌，以取得更多詳細資訊。

由索引模型根據 Issue 內容生成。