Settings bugfix and warning removal.

Set the default mode to player to allow fppd startup when there is
no settings config file.  I think this used to work and was
probably broken by the fpp mode enum changes.

Remove a warning in the settings file parsing that alerts if we
see a config option we don't know about.  This warns about
commented out entries and also makes warnings pop up when switching
back and forth between versions which might have different config
options, so just delete this fprintf call.
Merge branch 'stage' of github.com:FalconChristmas/fpp into stage