Update fortran_free-form.tmLanguage.json for labeled "if" and "where" statements

[wilsong-anl]

Some correct syntax of labeled "if" and "where" statements (things like a label starting with a capital or a space after an "else" in an "if" statement or a labeled "else where") messed up the syntax highlighting. This commit fixes those issues.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.30%. Comparing base (53d3bd2) to head (35eae1a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1241   +/-   ##
=======================================
  Coverage   81.30%   81.30%           
=======================================
  Files          12       12           
  Lines        2321     2321           
  Branches      191      191           
=======================================
  Hits         1887     1887           
  Misses        429      429           
  Partials        5        5           

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