GPS map: duplication of entry does not work

[gappc]

Duplication of GPS map entries does not work and throws an error (see screenshot below)

Steps to reproduce:

• open https://databrowser.opendatahub.testingmachine.eu/dataset/edit/tourism/v1/Accommodation/5CEA544EE34639034F07B79D4AEEB603#gps-data
• click on the three-dots icon right to the GPS entry => a menu is shown
• click on "Duplicate"

=> it is expected, that the entry is duplicated. Instead, nothing happens and an error is shown in the console

Note that the underlying implementation (EditListCell.vue and related components) seems to work fine, because trying to duplicate e.g. images works as expected (e.g. here: https://databrowser.opendatahub.testingmachine.eu/dataset/edit/tourism/v1/Accommodation/5CEA544EE34639034F07B79D4AEEB603#images)