[PT2][Observability] Change the log logic (pytorch#129201)

Summary: We only log the multiplier when users changes the default value.

Test Plan: see signal

Differential Revision: D58854330

Pull Request resolved: pytorch#129201
Approved by: https://github.com/Skylion007, https://github.com/dshi7

torch/_inductor/fx_passes/pad_mm.py

@@ -498,7 +498,7 @@ def write_pad():
             multiplier = torch._inductor.config.post_grad_fusion_options[
                 "shape_padding_multiplier"
             ].get("value", 1.1)
-        counters["inductor"]["shape_padding_multiplier"] += 1
+            counters["inductor"]["shape_padding_multiplier"] += 1
         should_pad = _skip_do_bench_times or ori_time > pad_time * multiplier
         set_cached_should_pad(key, should_pad)
         return should_pad