Fix item quality not defaulting to 20%

[ConnorThelin]

Fixes #7966 .

Description of the problem being solved:

Due to an incorrect If statement regarding setting quality to nil for Amulets, Belts, etc, items that should have quality set to 20 by default were going into NormaliseQuality() with a nil value for quality, causing it to get set to 0 by default.

Steps taken to verify a working solution:

• Verify current state, non-quality items had no option for quality, quality items had their default set to 0
• Make changes
• Check a non-quality item such as an Amulet, no option to set quality and no visible quality as expected.
• Check a quality item such as Body Armour, quality is set to 20 as a default.
• Check several other examples of both cases, behavior as expected for both non-quality and quality items that were tested

Link to a build that showcases this PR:

NA

Before screenshot:

Amulet Example:

Body Armour Example:

After screenshot:

Amulet Example:

Body Armour Example:

Additional Note:
This code still relies on NormalizeQuality() to properly set the default value from 0 to 20 in cases where a default quality is expected. I think it would be pertinent to remove the reliance CraftItem() has on NormalizeQuality() to properly set the default values, unless this behavior is intentional. I can look into this decoupling further if desired.