Fix get_required_parameters_for_parameter_table

[dweindl]

Check that placeholder parameters are only considered as such for either observable or noise formula

Closes AMICI-dev/AMICI#1470

[codecov-io]

Codecov Report

Merging #43 (7108366) into develop (6c46c00) will increase coverage by 0.10%.
The diff coverage is 85.00%.

@@             Coverage Diff             @@
##           develop      #43      +/-   ##
===========================================
+ Coverage    78.52%   78.63%   +0.10%     
===========================================
  Files           24       24              
  Lines         2296     2307      +11     
  Branches       541      545       +4     
===========================================
+ Hits          1803     1814      +11     
  Misses         360      360              
  Partials       133      133              

Impacted Files	Coverage Δ
petab/parameters.py	86.45% <50.00%> (+0.08%)	⬆️
petab/observables.py	97.10% <100.00%> (+0.49%)	⬆️

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