Ensure cleared path when starting new settings group

[hartez]

Following this suggestion, I started reading my custom settings directly from IApp.Settings. But I noticed that the keys for my settings weren't as expected.

With the following configuration:

MeadowCloud:
    # Enable Logging, Events, Command + Control
    Enabled: false

MyApp:
    Setting1: test1
    Setting2: test2

My custom settings keys were prefixed with MyApp (e.g., MyApp.Setting1). However, if I comment out all the settings in the previous section:

MeadowCloud:
    # Enable Logging, Events, Command + Control
    # Enabled: false

MyApp:
    Setting1: test1
    Setting2: test2

My custom settings keys were now prefixed with MeadowCloud.MyApp, and my code to retrieve them failed with a KeyNotFoundException.

The changes in this PR reset the settings level breadcrumbs when a new section starts, resulting in the expected key prefix for the setting.