SCons: Fix UWP build after #45315

(cherry picked from commit d1f023c35b8bed3fc839fdc5d587a839568aab44)

platform/uwp/SCsub

@@ -3,7 +3,6 @@
 Import("env")
 
 files = [
-    "thread_uwp.cpp",
     "#platform/windows/key_mapping_windows.cpp",
     "#platform/windows/windows_terminal_logger.cpp",
     "joypad_uwp.cpp",