Two update_max_potential_damage functions

[Santonia27]

hydomt_fiat version checks

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• I have checked that this bug exists on the latest version of hydomt_fiat.

Reproducible Example

When updating the pot. damages in the MB GUI, one functions is used and when running floodadapt or the test test_update_max_potential_damage in hydromt the oher functions is used.

Current behaviour

There are 2 functions for update_max_potential_damage. The one called by the MB GUI is in fiat.py and the one called in floodadapt in the exposure_vector.

Desired behaviour

only have one function

Task list

• investigate the reason for 2 different functions
• investigate where which function is used in detail
• merge both functions to one and only use one

Additional context

No response