Colour of Master bus on FX Mixer retains when switching project

[Monospace-V]

Bug Summary

If a project has the master bus on the FX-Mixer set a certain colour, and then we open any other project where the master channel does not have a colour set, master channel remains that colour.

Steps to reproduce

1. Create a project and change the colour of the mixer's master channel. Alternatively, open a project that has a non-default colour on the mixer's master bus.
2. In the same session of LMMS, create a new project, or open any other project where master channel's colour is still default.
3. Look at the colour of master channel on mixer.

Expected behavior

Master channel resets to default colour

Actual behavior

Master channel remains coloured

Demonstration:

https://user-images.githubusercontent.com/76674645/167285887-deb4df1e-348a-41a1-b69f-46275cc2e5a8.mp4

Affected LMMS versions

LMMS 1.3 (only version with ability to change FX-channel colours)

[spechtstatt]

Working on it.

[spechtstatt]

hopefully fixed!