timedate improvements

Merged Philip Müller requested to merge vfjpl:fixed_ntp_settings into master

Created by: vfjpl

-small cleanup -style consolidation -fixed RtcLocalCheckBox leaving apply button highlighted after ticking it and leaving and reentering time and date window -fixed NtpEnabledCheckBox not highlighting apply button -fixed if RtcLocalCheckBox is set to true then apply button is highlited on startup -fix #111 (closed) -closes #117 -data cleanup

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