Examples: Win32: Fixed examples using RegisterClassW() since 1.89 to also call DefWindowProcW(). (#5725, #5961, #5975)

Fixes the window title from being truncated on calls to Platform_SetWindowTitle. Stops the WM_SETTEXT message that happens when calling setWindowTextW from being interpreted as ascii.

examples/example_win32_directx11/main.cpp

@@ -247,5 +247,5 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
         ::PostQuitMessage(0);
         return 0;
     }
-    return ::DefWindowProc(hWnd, msg, wParam, lParam);
+    return ::DefWindowProcW(hWnd, msg, wParam, lParam);
 }