The KDE4 baloofilerc was only used by dolphin in the KDE4 migration
phase and is no longer needed.
In case a baloofilerc in the legacy location does not exist, the effect
is even worse - the KConfig is instantiated with an empty path, and the
config file name is derived from the application name. This leads to
adding a "[General]" section in e.g. kcmshell5rc or systemsettingsrc.
Also see T9897.