use lowercase name for sorting; keep `UpscalerLanczos` and `UpscalerNearest` at the start of the list with `UpscalerNone`

Co-authored-by: catboxanon <122327233+catboxanon@users.noreply.github.com>

modules/modelloader.py

@@ -6,7 +6,7 @@ from urllib.parse import urlparse
 
 from basicsr.utils.download_util import load_file_from_url
 from modules import shared
-from modules.upscaler import Upscaler, UpscalerNone
+from modules.upscaler import Upscaler, UpscalerLanczos, UpscalerNearest, UpscalerNone
 from modules.paths import script_path, models_path
 
 
@@ -172,5 +172,5 @@ def load_upscalers():
     shared.sd_upscalers = sorted(
         datas,
         # Special case for UpscalerNone keeps it at the beginning of the list.
-        key=lambda x: x.name if not isinstance(x.scaler, UpscalerNone) else ""
+        key=lambda x: x.name.lower() if not isinstance(x.scaler, (UpscalerNone, UpscalerLanczos, UpscalerNearest)) else ""
     )