remove hard coded inputs

[superstar54]

The expose_inputs of the pdos and bands are not needed anymore, because these are handled in the plugin entry part.

[AndresOrtegaGuerrero]

I did a test it works!, LGTM

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.06% ⚠️

Comparison is base (ba44f52) 63.71% compared to head (d75e7f5) 63.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #478      +/-   ##
==========================================
- Coverage   63.71%   63.66%   -0.06%     
==========================================
  Files          40       40              
  Lines        2701     2697       -4     
==========================================
- Hits         1721     1717       -4     
  Misses        980      980              

Flag	Coverage Δ
python-3.10	63.66% <ø> (-0.06%)	⬇️
python-3.8	63.71% <ø> (-0.06%)	⬇️
python-3.9	63.71% <ø> (-0.06%)	⬇️

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Files Changed	Coverage Δ
src/aiidalab_qe/workflows/__init__.py	53.33% <ø> (-1.22%)	⬇️

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