Update network checking method in commonUtils

- change method signature: replace 'Account account' parameter by 'boolean isMeteredNetworkAllowed'
- Extract code to check meteredNetwork from ContentResolver into a separate method: isMeteredNetworkAllowed(Account account)
- Update call to haveNetworkConnection() to fit with new signature. Use "true" for meteredNetwork in Activity, and load settings for ObserverService, SynchronizationService
& CreateRemoteFolderWorker.