stat `store.disk.cache.loaded` vary depending on running as daemon

[ignacioalles]

When running nuster as daemon with

nuster -D -f /etc/nuster/nuster.cfg -p /var/run/nuster.pid

stats reports

**STORE DISK**
store.disk.cache.dir:           /var/cache/nuster
store.disk.cache.loaded:        no

However, running the same setup without daemonizing it with

nuster -f /etc/nuster/nuster.cfg -p /var/run/nuster.pid

produces stat report like:

**STORE DISK**
store.disk.cache.dir:           /var/cache/nuster
store.disk.cache.loaded:        yes

However, it sems that persistent cache is not used anyway, as store.memory.cache.count is always reseted to zero.