Prefs: Fix cache size default settings
Prefs: Fix cache size default settings

The default settings always overrode user set ones.

RobertMe/sailfish-ytplayer,tworaz/sailfish-ytplayer,tworaz/sailfish-ytplayer,tworaz/sailfish-ytplayer,RobertMe/sailfish-ytplayer,RobertMe/sailfish-ytplayer,tworaz/sailfish-ytplayer,tworaz/sailfish-ytplayer,RobertMe/sailfish-ytplayer,RobertMe/sailfish-ytplayer