Bugfix: Fix StatAnalysis to set fcst_lev config variable instead of fcst_level

[georgemccabe]

This was discovered in discussion #2734.

Describe the Problem

StatAnalysis wrapper sets the fcst_level and obs_level MET config variables. However, the actual MET config variables are named fcst_lev and obs_lev.

Expected Behavior

Setting values in FCST_LEVEL_LIST or OBS_LEVEL_LIST should properly set the value of METPLUS_FCST_LEVEL and METPLUS_OBS_LEVEL to fcst_lev = <VALUE>; and obs_lev = <VALUE>; respectively.

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