Remove IBAN option from group export

[lodewiges]

Fixes #940

I removed the ability to download all IBAN because it is not stored in the user table but in the mandates table. besides that it is really sensitive data.

If we need this functionality we need to a export button to the mandates tab or fix it some other way

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 13.37%. Comparing base (ea79dbc) to head (904a21c).
Report is 8 commits behind head on staging.

Additional details and impacted files

@@           Coverage Diff            @@
##           staging     #939   +/-   ##
========================================
  Coverage    13.37%   13.37%           
========================================
  Files          450      450           
  Lines         3117     3117           
========================================
  Hits           417      417           
  Misses        2700     2700           

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[DrumsnChocolate]

Are we sure the avatar url is never used in the export?

[lodewiges]

Are we sure the avatar url is never used in the export?

i don't see the value of exporting. besides that it is for the manual export function