[Pharo-project] Preferences to settings refactoring: #decorateBrowserButton and #menuButtonInToolPane cases

Hi all, A slice is uploaded to pharoinbox: ------------ Name: SLICE-DecorateBrowserButtonAndMenuButtonInToolPaneRemoval-alain_plantec.2 Dependencies: Polymorph-Widgets-alain_plantec.75, System-Support-alain_plantec.31, Tools-alain_plantec.158 remove #decorateBrowserButton and #menuButtonInToolPane preferences ------------ Cheers Alain