Issue title: Settings are reset after every update.
 Issue body: After updating the app, the settings are always getting reset to the default settings. Please fix this.
 Comments: 
 Comment 0: This bug has been completely fixed. Just wait for a new version of the app to test it.
{'source': 'GithubIssues', 'repo_name_with_owner': 'ModuleArt/quick-picture-viewer', 'issue_id': 736720670, 'repo_stars': 542.0}