Describe the bug
When using Message colors with custom background colors, the alpha value of the color is not saved and will therefore not be applied.

To Reproduce

1. Go to Main -> Settings -> Msg. Colors
2. Add an item in the list (doesn't seem to matter, which item it is)
3. With enabled "background color" checkbox, configure color
4. Then use HSV, HSL, RGB or CMYK with custom alpha value (not equal to 255)
5. Save item, open saved item again
6. Alpha value was reset to 255 and also won't be applied in chat

Expected behavior
Custom alpha value of the color should be saved correctly and be applied in chat.

Debug Log
debug0.log

Screenshots/Videos

Additional information (please complete the following information):

• OS: Windows 10 Pro 22H2 (Build 19045.4291)
• Chatty Version: Chatty (Version: 0.26)
• Java Version: Standalone with Chatty
• When has the issue first occurred: Just discovered in v0.26, probably other versions affected as well
• How often does the issue occur: every time

/appinfo output:
Chatty Version 0.26 Hotkey [Memory] max: 158.720 / 614.400 free: 35.870 (19% full) [Uptime] 7m 0s [System] Java: 17.0.7 (Eclipse Adoptium / C:\Program Files (x86)\Chatty\runtime) OS: Windows 10 (10.0/amd64) Locale: de_DE [Connection] Connected to: irc.chat.twitch.tv/44.237.40.50:6697 (6m 58s, 3 channels)