Round weapon quality to two decimal points to avoid rounding issues

[mbiddle]

Describe Pull request
I noticed that the quality of weapons grows to a huge amount of decimal points so I updated the calculations to round to two decimal points.

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Questions (please complete the following information):

• Have you personally loaded this code into an updated qbcore project and checked all it's functionality?
• Does your code fit the style guidelines?
• Does your PR fit the contribution guidelines?

[Cocodrulo]

Looks good, great work!