fix: #3608797 FatalError: FormModeManagerDisplayEditForm::submitForm must be...

Michael Harrisrequested to merge
issue/form_mode_manager-3608797:3608797-fatalerror-formmodemanagerdisplayeditformsubmitform-must into 3.x

fix: #3608797 FatalError: FormModeManagerDisplayEditForm::submitForm must be compatible with EntityFormDisplayEditForm::submitForm

Related to #3608797

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