[BUG] The level select window settings gets overwritten

[japtar10101]

Describe the bug

The level select's window settings gets overwritten, even if the level passed is lower than the currently stored info.

To Reproduce

Steps to reproduce the behavior:

1. As an example, say the player completes level 3, then returns back to the start of the game.
2. The level select will have level 1, 2, and 3 unlocked.
3. The user clicks on level 1, loads it, then returns back to the game without completing the level.

Expected behavior

Level 2 & 3 will remain unlocked.

Actual behavior

Level 2 & 3 will be locked. Only Level 1 is unlocked.

Additional context

Carry-over from the old Bitbucket Mercurial project:
https://bitbucket.org/OmiyaGames/hg-template-unity-project/issues/71/the-level-select-window-settings-gets

[japtar10101]

In theory, this issue is resolved, but needs verification.