Fix season numbers not appearing when scrolling (#679)

**Description**

Fixes a regression where season numbers in the tab strip were invisible
when scrolling through long series (15+ seasons).

**Related issues**

Fixes #677

**AI/LLM usage**

Used Claude Code to analyze diffs from recent commits in order to find
which commit caused the regression.

---------

Co-authored-by: Damontecres <damontecres@gmail.com>

app/src/main/java/com/github/damontecres/wholphin/ui/detail/series/SeriesOverviewContent.kt

@@ -110,12 +110,10 @@ fun SeriesOverviewContent(
 
     val seasonStr = stringResource(R.string.tv_season)
     val tabs =
-        remember(seasons) {
-            seasons.mapNotNull {
-                it?.name
-                    ?: it?.data?.indexNumber?.let { "$seasonStr $it" }
-                    ?: ""
-            }
+        seasons.map { season ->
+            season?.name
+                ?: season?.data?.indexNumber?.let { "$seasonStr $it" }
+                ?: ""
         }
     val focusRequesters = remember(seasons) { List(seasons.size) { FocusRequester() } }