Remove check for sheetState.isModal from onDragging lambda

[sevbanBayir]

Types of changes

• Bottom Sheet visibility bug when dismissing #30 Bugfix (non-breaking change which fixes an issue)

This PR is about to fix FlexibleBottomSheet's visibility (flashing) issue when using a scrollable element in it. The issue is happening only for Modal versions and to address that removed an if check assigning isDragging to the value captured in onDragging lambda.

Bug evidence:

Ekran.Kaydi.2024-09-01.12.14.18.mov

Resolved evidence:

Ekran.Kaydi.2024-09-01.12.15.32.mov

Minimum reproducable example:

@Composable
fun BugReproduceExample(
  onDismiss: () -> Unit
) {
  val sheetState = rememberFlexibleBottomSheetState(
    isModal = true,
  )

  FlexibleBottomSheet(
    onDismissRequest = onDismiss,
    sheetState = sheetState
  ) {

    Column(
      modifier = Modifier
          .padding(horizontal = 20.dp)
          .verticalScroll(rememberScrollState()),
    ) {
      repeat(50) {
        Text(text = "Text in scrollable column", style = MaterialTheme.typography.headlineLarge)
        Spacer(Modifier.height(16.dp))
      }
    }
  }
}

[skydoves]

Looks good to me. Thank you so much for your contribution!