Localizable: Remove unused UNTITLED_SHOW

Resources/en.lproj/Localizable.strings

@@ -75,7 +75,6 @@
 "BUTTON_RENDERER_HINT" = "Show a menu of available casting devices";
 
 "UPGRADING_LIBRARY" = "Upgrading Media Library";
-"UNTITLED_SHOW" = "Untitled Show";
 "UNKNOWN" = "Unknown";
 
 "OPEN_NETWORK" = "Open Network Stream";