fix issue with incorrect station metadata info while reading lma file

[gewitterblitz]

This should resolve issue #48.

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All modified and coverable lines are covered by tests ✅

Project coverage is 78.10%. Comparing base (f945c5e) to head (4e22a94).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #49   +/-   ##
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  Coverage   78.10%   78.10%           
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  Files          13       13           
  Lines        1955     1955           
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  Hits         1527     1527           
  Misses        428      428           

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[wx4stg]

tested and confirmed that this resolves the referenced issue.

In summary, If multiple stations have duplicate ID letters, as long as <=1 is marked as "active", the file will read in to XLMA (tested using IDL 7 on windows arm64) but will not read into xlma-python, but this PR fixes that issue (this is also useful to know for my own personal future reference... thanks!)

closes #48

[deeplycloudy]

Thanks for finding and proposing a fix @gewitterblitz, and for the review @wx4stg. Merging!