[Batch edit] does not work for misc. attributes on assets

[heigpa]

Steps to reproduce

• Login as admin
• Open the car images folder
• Select the first 3 images
• Start a batch editing process
• Edit one of the Misc fields (Misc.alternativeTitle, Misc.recheckDate, Misc.checked)
• Apply changes

Actual behaviour

• Batch edit process ends with error message (Batch edit failed)

Expected behaviour

• New values should be applied without an error message

Environment

• Public Demo
• Windows
• Google Chrome

[lukmzig]

This issue should be resolved by following PR: pimcore/studio-backend-bundle#1089