Fix a loop between our logger and rollbar

[rafatower]

See https://app.clubhouse.io/cartoteam/story/126685/infinite-loop-when-rollbar-error-processing

See https://docs.rollbar.com/docs/gem-configuration-reference

default_logger
What logger to use for printing debugging and informational messages during operation.
Default: Logger.new(STDERR) or ::Rails.logger when using Rails

logger
The logger to use instead of the default logger. Especially useful when you wish to send log messages elsewhere.

thanks @amiedes for pointing out