Update FlopCounterMode usage in throughput.py (#19926)

`mods` argument is not needed anymore for `FlopCounterMode`:
ffe506e853/torch/utils/flop_counter.py (L595-L596)

src/lightning/fabric/utilities/throughput.py

@@ -296,7 +296,7 @@ def measure_flops(
         raise ImportError("`measure_flops` requires PyTorch >= 2.1.")
     from torch.utils.flop_counter import FlopCounterMode
 
-    flop_counter = FlopCounterMode(model, display=False)
+    flop_counter = FlopCounterMode(display=False)
     with flop_counter:
         if loss_fn is None:
             forward_fn()