fix the editor generate progress state exceed 100

[mingXta]

The editor generate mock progress may exceed 100. original code:

setGenerateProgress(p => {
      if (p < 90) return p + 20 * Math.random()
      if (p >= 90 && p < 100) return p + 1 * Math.random()
      window.setTimeout(() => setIsInpaintingLoading(false), 500)
      return p
    })

I changed 20 to 10 and 100 to 99:

setGenerateProgress(p => {
      if (p < 90) return p + 10 * Math.random()
      if (p >= 90 && p < 99) return p + 1 * Math.random()
      window.setTimeout(() => setIsInpaintingLoading(false), 500)
      return p
    })