Revert "[applets/batterymonitor] PowerManagement: Fix layout height without inhibitions"

This reverts commit 354f7da871.

Somehow it prevents inhibitions from being visible in the UI. Since the
reason is not yet understood, let's revert for now to prevent releasing
a regression while we investigate.

CCMAIL: me@ratijas.tk

applets/batterymonitor/package/contents/ui/PowerManagementItem.qml

@@ -54,8 +54,6 @@ ColumnLayout {
 
         Layout.fillWidth: true
 
-        visible: visibleChildren.length > 0
-
         InhibitionHint {
             Layout.fillWidth: true
             visible: pmSource.data["PowerDevil"] && pmSource.data["PowerDevil"]["Is Lid Present"] && !pmSource.data["PowerDevil"]["Triggers Lid Action"] ? true : false