double click link to copy to clipboard resets after app restart

[joh-klein]

Describe the bug
When the setting "workflow -> double click on link" is changed from the default "open link" to "copy link" it only works till the app is closed (cmd+q). After opening it again the setting is back to the default

To Reproduce
Steps to reproduce the behavior:

1. Go to Settings
2. Click on Workflow
3. Change "double click on link" to "copy link"
   3a. Make sure it works (Double click on a address of an entry should not open a browser but give a modal "link copied"
4. Close App (CMD+Q)
5. Open App
6. Double click on an address of an entry
7. The browser should open instead of the link being copied to the clipboard

Expected behavior
The setting is remembered

Desktop (please complete the following information):

• macOS: 10.14.6
• MacPass Version: 0.7.10 (22740)

[mstarke]

Nice find, this issue is present since 2b1de3d which is sort of forever. Fixed in 3817bf5.