[FR] Add a forced overwrite policy to the synchronization policy

### Describe the feature you'd like to request

Add a forced overwrite policy to the synchronization policy

### Describe the solution you'd like

Delete all content in the bookmark file and rewrite each time the synchronization policy is used

### Describe alternatives you've considered

Some browsers generate bookmark files with different structures (such as via) and floccus, resulting in bookmark files that cannot be rewritten floccus after they are modified.