`mm` unit is displayed after using CTRL+W and restarting the application

[jcfr]

Description In some situation, the unit displayed in the application is not um but mm

Expected behavior It should always be um

How to Reproduce

1. Remove all settings files (Use ./CellLocator --settings-path to get the directory containing the settings)
2. Start the application
3. Check that um is displayed
4. CTRL+W
5. Close and Restart the Application
6. mm is now displayed

Suggested Workaround

Delete application settings files.

Settings are stored in a *.ini files located in directory like these ones:

• Windows: %USERPROFILE%\AppData\Roaming\Allen Institute\ (typically C:\Users\<your_user_name>\AppData\Roaming\Allen Institute\)
• Linux: ~/.config/Allen Institute/
• macOS: ~/.config/alleninstitute.org/