Fix: allow zero value using nullish coalescing operator(Slider)

[KumJungMin]

Defect Fixes

• fix Slider: For negative Min value and positive max value, if default value is set to zero, then it shows wrong position. #7072
• The issue where the value is being reset to the minimum, when the value is 0 occurs
• Because the logical OR (||) operator treats 0 as a falsy value.
• To address this, I modified the operator to use the nullish coalescing operator (??)(mdn docs), which only checks for null or undefined, ensuring that a value of 0 is preserved and not replaced by the default.

Test

When the min value is set to -180 and the max value is set to 180.

Before

• When the value is 0, the handle moves to the wrong position.

2024-08-24.11.14.00.mov

After

2024-08-24.11.12.57.mov

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