tests: Fixed regression default value regression.
tests: Fixed regression default value regression.

The newly added user-specific configuration file in
`tests/config/marc' set default DATA_MIN and DATA_MAX values that were
too small, which resulted in large negative and positive being
unmapped.  Choose much larger values to address this regression.

ossama-othman/MaRC,ossama-othman/MaRC,ossama-othman/MaRC