refactor: plus, minus 한계치 수정

app/src/main/java/woowacourse/shopping/view/productdetail/ProductDetailPresenter.kt

@@ -39,15 +39,14 @@ class ProductDetailPresenter(
  }
 
  override fun plusCount() {
- if (_count.value in COUNT_MIN until COUNT_MAX) _count.value = _count.value?.plus(1)
+ _count.value = _count.value?.plus(1)
  }
 
  override fun minusCount() {
- if (_count.value in COUNT_MIN + 1..COUNT_MAX) _count.value = _count.value?.minus(1)
+ if ((_count.value ?: 1) > COUNT_MIN + 1) _count.value = _count.value?.minus(1)
  }
 
  companion object {
- private const val COUNT_MAX = 100
  private const val COUNT_MIN = 1
  }
 }