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 81.45%. Comparing base (e77b2ec) to head (9758eaf).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1241   +/-   ##
=======================================
  Coverage   81.45%   81.45%           
=======================================
  Files          13       13           
  Lines        2405     2405           
  Branches      196      196           
=======================================
  Hits         1959     1959           
  Misses        441      441           
  Partials        5        5           

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[gnikit]

Do we have some small examples for this that we can add to the tests that the syntax is fixed and guard against regressions?

[wilsong-anl]

Here's a small example of what I'd seen:

RType: if (condition_1) then
    continue
else if (condition_2 .or. condition_3) then RType
    continue
else RType ! "RType" was red and comment was white here
    continue ! continue was white here
end if RType
ZType: where (mask_1)
    continue
else where (mask_2) ZType ! "ZType" was red here
    continue
else where ZType ! "ZType" was red here 
    continue
end where ZType

[gnikit]

Here's a small example of what I'd seen:

RType: if (condition_1) then
    continue
else if (condition_2 .or. condition_3) then RType
    continue
else RType ! "RType" was red and comment was white here
    continue ! continue was white here
end if RType
ZType: where (mask_1)
    continue
else where (mask_2) ZType ! "ZType" was red here
    continue
else where ZType ! "ZType" was red here 
    continue
end where ZType

Thanks @wilsong-anl will add the test and check locally. I need to think a bit if the complexity in time for the regex changes drastically, but other than that I looks good