possible to set expanded=false for a containment

Summary:
it will still have no visible effect, but
is possible to read and write the property if
containments make use of it (the systray uses it for
opening/closing its popup)

Test Plan: setting expanded : false to containments doesn't break them

Reviewers: #plasma, broulik

Reviewed By: #plasma, broulik

Subscribers: plasma-devel, #frameworks

Tags: #plasma, #frameworks

Differential Revision: https://phabricator.kde.org/D4866

src/plasmaquick/appletquickitem.cpp

@@ -702,12 +702,6 @@ bool AppletQuickItem::isExpanded() const
 
 void AppletQuickItem::setExpanded(bool expanded)
 {
-    if (d->applet->isContainment()) {
-        expanded = true;
-    }
-
-    //if there is no compact representation it means it's always expanded
-    //Containments are always expanded
     if (d->expanded == expanded) {
         return;
     }