fix: build passive layers for DD4hep

[asalzburger]

This PR fixes an issue that only the beam pipe was regarded as a passive layer to be built, an issue easily spotted in the OpenDataDetector setup.

With this one-line fix, suddenly the Solenoid and the Pixel Support Tube show up.

12:21:38    DD4hepConver   INFO      Translating DD4hep geometry into Acts geometry
12:21:38    DD4hepConver   INFO      Translating DD4hep sub detector: BeamPipe
12:21:38    DD4hepConver   INFO      Translating DD4hep sub detector: Pixels
12:21:38    DD4hepConver   INFO      Translating DD4hep sub detector: PST
12:21:38    DD4hepConver   INFO      Translating DD4hep sub detector: ShortStrips
12:21:38    DD4hepConver   INFO      Translating DD4hep sub detector: LongStrips

[codecov]

Codecov Report

Merging #892 (045bff4) into main (99df92e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #892   +/-   ##
=======================================
  Coverage   48.66%   48.66%           
=======================================
  Files         331      331           
  Lines       17129    17129           
  Branches     8094     8094           
=======================================
  Hits         8336     8336           
  Misses       3087     3087           
  Partials     5706     5706           

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