Fix #2437: The current panel will not be added to the history if it’s already the last panel

[axshaykp]

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Description

Duplicate entries in the previous panel path were preventing the back button from navigating to the previous panel, which hindered container editing.

Type of change

Select all that apply.

• Bug fix
• New feature
• Major change (fix or feature that would cause existing functionality to work differently than in the current version)

Tag issues related to this pull request:

• Intermittent back button issue prevent editing containers #2437

[dannycolin]

While the change seems to work in this specific step-to-reproduce, it introduces an issue in the conditional logic in the following scenario:

1. Open popup to show containerList
2. Click on the right arrow of the Personal container to go to the containerInfo panel
3. In containerInfo panel, click on "manage this container" button
4. In containerEdit panel, click on the back button to go to the previous panel containerInfo
5. In containerInfo panel, click on the back button to go to the previous panel containerList

On the last step, backwards value is set to false but it should be set to true since we clicked on the back button.