[FIX] ensures that metadata file have the same prefix as the queried file

[Remi-Gau]

Fixes the issue of querying file with metadata files in the root directory (hence sometimes with no "_" before the suffix, like T1w.json) while still being able to query files with suffixes that might be part of another suffix: _thickness.json and midthickness.json.

[codecov]

Codecov Report

Merging #195 (37e2283) into dev (7f2a6a0) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff          @@
##             dev    #195   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
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  Files         25      25           
  Lines        933     933           
=====================================
  Misses       933     933           

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

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Impacted Files	Coverage Δ
+bids/+internal/get_metadata.m	0.00% <0.00%> (ø)

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