Flatpak version does not follow user preferences for terminal colors

### What Happened?

The color palette in the terminal pane differs from the native Terminal app and is generally less readable.

### Steps to Reproduce

Run Flatpak and look at terminal pane.

### Expected Behavior

The terminal pane should use the same colors as the Terminal app (when running on elementaryos at least) or failing that use readable colors.

### OS Version

8.x (Circe)

### OS Architecture

amd64 (on most hardwares)

### Session Type

Secure Session (Wayland, This is the default)

### Software Version

Latest release (I have run all updates)

### Log Output

```shell

```

### Hardware Info

_No response_