Revert "UPBGE: Comment code which gives a warning in export as runtime"

This reverts commit ada1079.

Thanks @lordloki for info about copyright.txt file

Author: youle31

game_engine_save_as_runtime_eevee.py

@@ -269,10 +269,10 @@ def WriteRuntime(player_path, output_path, new_icon_path, copy_python, overwrite
     src = os.path.join(blender_dir, "license")
     dst = os.path.join(runtime_dir, "engine.license")
     shutil.copytree(src, dst)
-    #license_folder = os.path.join(runtime_dir, "engine.license")
-    #src = os.path.join(blender_dir, "copyright.txt")
-    #dst = os.path.join(license_folder, "copyright.txt")
-    #shutil.copy2(src, dst)
+    license_folder = os.path.join(runtime_dir, "engine.license")
+    src = os.path.join(blender_dir, "copyright.txt")
+    dst = os.path.join(license_folder, "copyright.txt")
+    shutil.copy2(src, dst)
     print("done")
 
 from bpy.props import *