feat(preset-mini): add webkit vendor prefix to user-select

[sapphi-red]

Safari requires -webkit- vendor prefix for user-select.

This PR was created in past (#1411) and was declined but given that

• this comment: Vendor prefixes #12
• other rules handles vendor prefixes
  • examples

    • unocss/packages/preset-wind/src/rules/filters.ts

      Lines 48 to 50 in 339f2b2

      	[`--un-${b}${varName}`]: `${varName}(${value})`,
      	'-webkit-backdrop-filter': backdropFilterProperty,
      	'backdrop-filter': backdropFilterProperty,

    • unocss/packages/preset-mini/src/_rules/behaviors.ts

      Lines 22 to 25 in 339f2b2

      	['appearance-none', {
      	'appearance': 'none',
      	'-webkit-appearance': 'none',
      	}],

, I think it makes sense to add this.

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[antfu]

Safari would never let me down :)