fix: Correct GuidedTourScreen after pager migration

Fixed the build errors in GuidedTourScreen.kt that occurred after migrating to androidx.compose.foundation.pager.
- Added pageCount to rememberPagerState.
- Removed count from HorizontalPager.
- Restored the R import.

app/src/main/java/de/lxtools/noteshop/ui/GuidedTourScreen.kt

@@ -21,12 +21,13 @@ import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 
 
+import de.lxtools.noteshop.R
 import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.foundation.pager.HorizontalPager
 
 @Composable
 fun GuidedTourScreen(onTourFinished: () -> Unit) {
-    val pagerState = rememberPagerState()
+    val pagerState = rememberPagerState(pageCount = { 3 })
 
     Column(
         modifier = Modifier.fillMaxSize(),
@@ -34,7 +35,7 @@ fun GuidedTourScreen(onTourFinished: () -> Unit) {
         verticalArrangement = Arrangement.Center
     ) {
         HorizontalPager(
-            count = 3,
+
             state = pagerState,
             modifier = Modifier.weight(1f)
         ) { page ->