Summary: During testing, observed that Flipper always starts with an exception if `darkMode` is `true` or `false` (the old format) during startup, and this exception keeps on happening until the setting is changed. The root cause is that the setting is treated verbatim since D30666966 (9a4d94c971), trigger a very confusing Electron error. This diff addresses that.
Reviewed By: timur-valiev
Differential Revision: D30806453
fbshipit-source-id: fc7bbdda4e8bdf2dc4e3ca7ab1b05984c9406c68
e1e9ca0f52
