[quant][graphmode][fx][fix] Fix typo in fusion (#49183)

Summary: Pull Request resolved: #49183

Test Plan: Imported from OSS

Reviewed By: hx89

Differential Revision: D25473367

fbshipit-source-id: 0cd5e6769eeea0923dd104ea90b0192e3475b3ad

torch/quantization/fx/fuse.py

@@ -35,7 +35,7 @@ def fuse(self, model: GraphModule,
         self.modules = dict(input_root.named_modules())
 
         additional_fusion_patterns = \
-            fuse_custom_config_dict.get("additional_quant_pattern", {})
+            fuse_custom_config_dict.get("additional_fusion_pattern", {})
         fusion_patterns = get_combined_dict(
             get_default_fusion_patterns(), additional_fusion_patterns)
         # find fusion