[Feature Request]: Don't store defaults in the presets JSON file

[luisbocanegra]

I have:

• Searched if this feature hasn't been requested yet.
• Verified that I am using the latest version (see Widget settings > About page or top right corner for version 1.1.0 and later), should be the same as https://github.com/luisbocanegra/plasma-panel-colorizer/releases/latest

Install method used:

• Using Plasma's "Add new widget" (KDE Store)
• AUR
• Nix package
• Manually from the latest source code

Is your feature request related to a problem? Please describe.

Currently when the settings are saved it contains all of the settings even if they have the same content as the default

Describe the solution you'd like

Only store settings that diverge form the defaults, which would result in smaller files, and possibly help with preset loading issues like #241 #298 #289

Describe alternatives you've considered

None, suggestions are welcome though as the current mechanism of parsing JSON back and forth is a mess

Additional context

None