Paintroid-726 : Fix project overflow menu button color

[vishad-tyagi]

Ticket: Paintroid-726
https://catrobat.atlassian.net/browse/PAINTROID-726

New Features and Enhancements

• Added optional iconColor property to project_overflown_menu

Refactorings and Bug Fixes

• In landing_page set ProjectOverflowMenu color to onBackground from color_schemes

Checklist

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[msesko]

Looks fine now, but same as with other PR, let's wait for theming to be handed. Should be done on Tuesday on the teamday that we have

[juliajulie95]

Please resolve conflicts