inconsistent flag format for apps config

[0pcom]

It appears that we use flags inconsistently (in some cases incorrectly) for the apps, currently.

I'm not sure why we haven't noticed errors from this yet.

The way the code is currently on develop, the apps use the "flags" package, which accepts flags in the format -flag and not --flag

here it's in the single hyphen format
https://github.com/skycoin/skywire/blob/develop/pkg/visor/visorconfig/config.go#L247

but in pkg/visor/api we use the double hyphen format in some places and single hyphen in other places
https://github.com/skycoin/skywire/blob/develop/pkg/visor/api.go#L777
https://github.com/skycoin/skywire/blob/develop/pkg/visor/api.go#L797

#1704 addresses this

[0pcom]

fixed in #1704