remove tab in biolink model

[sneakers-the-rat]

the tiniest PR in the world.

re: linkml/linkml-runtime#306

if yamllib (rather than pure python pyyaml) tries to read a multiline string that starts with a \t it chokes.

replace \t with two spaces

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.74%. Comparing base (f9012e1) to head (3cffe72).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1971   +/-   ##
=======================================
  Coverage   80.74%   80.74%           
=======================================
  Files         104      104           
  Lines       11576    11576           
  Branches     2899     2899           
=======================================
  Hits         9347     9347           
  Misses       1691     1691           
  Partials      538      538           

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