Revert "fix(player): prevent Back key from triggering player controls"

This reverts commit 3dc757f0f7.

app-tv/src/main/java/hu/bbara/purefin/ui/screen/player/TvPlayerScreen.kt

@@ -515,7 +515,7 @@ internal fun handleTvPlayerRootKeyEvent(
 ): Boolean {
     if (event.type != KeyEventType.KeyDown) return false
 
-    if (event.key == Key.Escape) {
+    if (event.key == Key.Back || event.key == Key.Escape) {
         return when {
             trackPanelType != null -> {
                 onCloseTrackPanel()