Add adjustment option for margin separator width

Merged Tanbir Jishan requested to merge tantalising/plasma-desktop:margin_separator into master

Margin separator by default has a large width which may not be desirable always and it is also not directly related to its core functionality. Letting the user adjust it if needed will be useful.

BUG: 451164 FIXED-IN: 5.25

Edited by Nate Graham

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