[ENH] filter dicoms earlier to avoid nibabel crash with XA ill-formed mutli-planar localizer dicoms

[bpinsard]

see nipy/nibabel#1392 (comment)

Apparently some of the validation of the dicom triggers nibabel.nicom that crashes on ill-formed dicoms.
Moving the dicom filter a bit before, allow to easily filter these with the heuristics filter_dicom.
I should not change anything to the results.

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.48%. Comparing base (17fdfb4) to head (4ce1119).

Files with missing lines	Patch %	Lines
heudiconv/dicoms.py	75.00%	2 Missing ⚠️
heudiconv/heuristics/reproin.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #806   +/-   ##
=======================================
  Coverage   82.48%   82.48%           
=======================================
  Files          42       42           
  Lines        4323     4323           
=======================================
  Hits         3566     3566           
  Misses        757      757           

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