Loading indicator persists after clicking back button

[partly-igor]

Description

After searching for a location if a user hits the browser's back button the loading indicator will display once the page is loaded. We don't want this to show because it makes it seem like the user has submitted a new search query. This happens both when the starting point is either the home page or the point forecast page.

To replicate:

1. On the homepage of beta.weather.gov search for any location
2. After the point forecast page loads click the browser's back button
3. The loading indicator appears on the home page

Similarly

1. From any point forecast page search for a different location
2. Once the 2nd location page has loaded click the browser's back button
3. The loading indicator appears on the first point forecast page.

Acceptance criteria

• After searching for a location and clicking the back button, the loading indicator does not show on the resulting page (the previous one in history)
• Tests have been implemented or modified to capture the bug
• Changes have been tested for accessibility