Fortran: fix wrongly specified xtag type

[masatake]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (6b06565) 82.99% compared to head (ddf3fb3) 82.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3718      +/-   ##
==========================================
- Coverage   82.99%   82.98%   -0.02%     
==========================================
  Files         226      226              
  Lines       54972    54977       +5     
==========================================
- Hits        45626    45624       -2     
- Misses       9346     9353       +7     

Impacted Files	Coverage Δ
parsers/fortran.c	96.10% <100.00%> (ø)

... and 1 file with indirect coverage changes

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