return live preview defaults to how they were

only download TAESD model when it's needed
return calculations in single_sample_to_image to just if/elif/elif blocks
keep taesd model in its own directory

webui.py

@@ -144,21 +144,10 @@ Use --skip-version-check commandline argument to disable this check.
             """.strip())
 
 
-def check_taesd():
-    from modules.paths_internal import models_path
-
-    model_url = 'https://github.com/madebyollin/taesd/raw/main/taesd_decoder.pth'
-    model_path = os.path.join(models_path, "VAE-approx", "taesd_decoder.pth")
-    if not os.path.exists(model_path):
-        print('From taesd repo download decoder model')
-        torch.hub.download_url_to_file(model_url, model_path)
-
-
 def initialize():
     fix_asyncio_event_loop_policy()
 
     check_versions()
-    check_taesd()
 
     extensions.list_extensions()
     localization.list_localizations(cmd_opts.localizations_dir)