fcitx5 input method support

**Describe the bug**

cannot type Chinese by fcitx5 ime in toolbox GUI apps

**Steps how to reproduce the behaviour**

use GUI app like xterm

**Actual behaviour**

ime no availble

**Output of `toolbox --version` (v0.0.90+)**

`toolbox version 0.0.99.3`

**Toolbox package info (`rpm -q toolbox`)**

`toolbox-0.0.99.3-7.fc37.x86_64`

**Output of `podman version`**

```
Client: Podman Engine
Version: 4.2.1
API Version: 4.2.1
Go Version: go1.19
OS/Arch: linux/amd64
```

**Podman package info (`rpm -q podman`)**

`podman-4.2.1-2.fc37.x86_64`

**Info about your OS**

Fedora Spin KDE plasma 37 beta

**Additional context**

I use Arch Linux as toolbox image (see Archwiki to get it)