client-factory: add TP_ACCOUNT_FEATURE_STORAGE
client-factory: add TP_ACCOUNT_FEATURE_STORAGE

Needed for the Ubuntu Online Accounts plugins.

GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,Distrotech/telepathy-account-widgets