Fix Aimdo fallback on probe to not use zero-copy sft (#12634)

* utils: dont use comfy sft loader in aimdo fallback

This was going to the raw command line switch and should respect main.py
probe of whether aimdo actually loaded successfully.

* ops: dont use deferred linear load in Aimdo fallback

Avoid changes of behaviour on --fast dynamic_vram when aimdo doesnt work.

comfy/utils.py

@@ -29,7 +29,7 @@ import itertools
 from torch.nn.functional import interpolate
 from tqdm.auto import trange
 from einops import rearrange
-from comfy.cli_args import args, enables_dynamic_vram
+from comfy.cli_args import args
 import json
 import time
 import mmap
@@ -113,7 +113,7 @@ def load_torch_file(ckpt, safe_load=False, device=None, return_metadata=False):
     metadata = None
     if ckpt.lower().endswith(".safetensors") or ckpt.lower().endswith(".sft"):
         try:
-            if enables_dynamic_vram():
+            if comfy.memory_management.aimdo_enabled:
                 sd, metadata = load_safetensors(ckpt)
                 if not return_metadata:
                     metadata = None