add missing fsLR reg sphere to io_spec

[bpinsard]

Should fix #381

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (16f9311) 54.90% compared to head (7a20c4b) 54.90%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #382   +/-   ##
=======================================
  Coverage   54.90%   54.90%           
=======================================
  Files          23       23           
  Lines        1601     1601           
  Branches      212      212           
=======================================
  Hits          879      879           
  Misses        666      666           
  Partials       56       56           

Flag	Coverage Δ
ds005	∅ <ø> (∅)
ds054	43.91% <ø> (ø)

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Files	Coverage Δ
smriprep/utils/bids.py	47.00% <ø> (ø)

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