powerdevilcore: Add some context to debug output
So that with debug output we get
org.kde.powerdevil: Currently using activity "428fa590-1920-4b3c-a7e1-1842e6164707"
org.kde.powerdevil: Activities with settings: () ()
org.kde.powerdevil: Settings for loaded activity: "428fa590-1920-4b3c-a7e1-1842e6164707" () ()
Instead of
org.kde.powerdevil: Currently using activity "428fa590-1920-4b3c-a7e1-1842e6164707"
org.kde.powerdevil: () ()
org.kde.powerdevil: () ()