Fix issue with scrolling to the right episode if there are specials in the season (#1827)

## Description
Fixes an edge case where clicking on an episode to go to Series Overview
wouldn't scroll to the episode if there is a special (season 0) episodes
in the episode list.

Dev note: to simplify things, if the entire dataset is cached, then just
search with `indexOf`. Often the data is cached because 20 seasons or
100 episodes are fetched initially which covers many shows.

### Related issues
Follow up to #1708 

### Testing
Emulator and unit tests

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/util/RequestPager.kt

@@ -24,7 +24,7 @@ import java.util.function.Predicate
  */
 abstract class RequestPager<T>(
     protected val scope: CoroutineScope,
-    protected val pageSize: Int = DEFAULT_PAGE_SIZE,
+    val pageSize: Int = DEFAULT_PAGE_SIZE,
     cacheSize: Long = 8,
 ) : AbstractList<T?>(),
     BlockingList<T?> {