custom modifier register conflict

[RokasEl]

if registering a modifier that has the same name as modifier in config, only the new modifier will be loaded

[PythonFZ]

for this to work, the schema has to be updated with the default values as well. This could happen here https://github.com/zincware/ZnDraw/blob/2a248c5f4fb1d7c5ccebc5a491cd3fa0f745b411/zndraw/zndraw.py#L446-L460

and was implemented like this until it was removed by accident, because it wasn't tested properly https://github.com/zincware/ZnDraw/blob/5dd4fed9904e36b646a67297c9dc90eeadf4e540/zndraw/app.py#L91-L94

[codecov-commenter]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (d160a00) 57.78% compared to head (a06e5a7) 57.79%.

Files	Patch %	Lines
zndraw/zndraw.py	60.00%	8 Missing :warning:
zndraw/settings.py	50.00%	2 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #313   +/-   ##
=======================================
  Coverage   57.78%   57.79%           
=======================================
  Files          18       18           
  Lines        1606     1630   +24     
=======================================
+ Hits          928      942   +14     
- Misses        678      688   +10     

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