Reader settings: unfollowing a site and making a configuration change removes it from list of followed sites

This issue was raised while reviewing #11343

Expected behavior

In Reader > Settings > Followed Sites, when unfollow a site and make a configuration change, we want the unfollowed site to remain listed.

Actual behavior

In Reader > Settings > Followed Sites, when unfollow a site and make a configuration change, we get the unfollowed site is removed from the list.

Steps to reproduce the behavior

• Go to Reader settings
• Select the Followed Sites tab
• Unfollow a followed site and make a device screen rotation
• Check that the unfollowed site is removed from the list

NOTE with some more context taken from here

Currently we keep a site in the list when unfollowed in case the user changes his mind and we remove it once the user leave that screen; what happens is that we end up removing it from the list also on config changes in that same screen that seems an unwanted behaviour.

Tested on [Pixel 3 Emu], Android [API 29], WPAndroid [14.2 with Information Architecture active]

Start by reproducing the issue in Reader settings under Followed Sites: unfollow a site, rotate the device, and inspect when the site is removed. Done means the unfollowed site remains listed through configuration changes on that screen and is removed only after leaving it.