wallpapers/color: Add back "ServiceTypes" property in metadata.json

Fushan Wenrequested to merge
work/fusionfuture/BUG448625-bring-color-back into master

In containmentconfigview.cpp, "Plasma/Wallpaper" is checked if a plugin is of ServiceType Plasma/Wallpaper.

BUG: 448625 FIXED-IN: 5.24

Edited by Fushan Wen

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