Dropdown for organization units is limited to 20 pos in the budget page

### Shopware Version

6.7.13.0

### Affected area / extension

Extension:Commercial

### Actual behaviour

If a customer with active B2B components has more than 20 organisation units, not all are present in the dropdown list on the "new Budget" page.

The list is limited to 20 entries.

### Expected behaviour

All organisation units should be available in the dropdown.

### How to reproduce

Define a customer with active B2B Components including organisation units.

Login as the customer and define more than 20 organisation units.

Add a new budget and open the dropdown. Only the first 20 entries are visible.

Reproduce the issue by configuring a customer with B2B Components, creating more than 20 organisation units, and opening the new Budget page dropdown. Trace the budget page's organisation-unit loading and selection behavior; done means every organisation unit is available rather than only the first 20.

Written by the indexing model from the issue text.