Remove support for PB2NC_OBS_PREPBUFR_MAP

[georgemccabe]

Users are encouraged to set obs_bufr_map instead of obs_prepbufr_map. We should not support setting this variable if it is not recommended to use. This was added in 4.1.0-beta5, so we can remove it without too much trouble.

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See above

Time Estimate

~1 hour

Relevant Deadlines

4.1.0

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NONE

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