Guake uses default colors on non-primary workspace terminals

**Describe the bug**

Guake does not remember settings for non-primary workspace. Specific, the terminal color. Simply opening the preferences on the second workspace fixes the problem.

See video for example of bug (and the temporary fix): https://youtu.be/RpJvngHJUmI

**Expected behavior**

Guake should use my color preferences on all workspace terminals when starting up

**Actual behavior**

Guake uses the default colors on non-primary workspace terminals until the preferences are opened.

**To Reproduce**

- Use X11 and recent version (tested on 3.6 and master)
- Enable workspace-specific tab set
- Open Guake in 2 workspaces
- Restart Guake
- Go to second workspace
- Open Guake

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$ guake --support

Guake Version: 3.7.1

Vte Version: 0.62.0

Vte Runtime Version: 0.62.0

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GTK+ Version: 3.24.23

GDK Backend: GdkX11.X11Display

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Desktop Session: gnome-xorg

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Display: :1

RGBA visual: True

Composited: True

* Monitor: 0 - GSM DP-1
* Geometry: 3440 x 1440 at 0, 0
* Size: 800 x 340 mm²
* Primary: True
* Refresh rate: 59.97 Hz
* Subpixel layout: unknown