fix: bug in infer script (#290)

The fix proposed by @Gaozhongpai. Thank you @Gaozhongpai.

inference.sh

@@ -59,14 +59,14 @@ cmd_args="--inference_config $config_path \
     --result_dir $result_dir \
     --unet_model_path $unet_model_path \
     --unet_config $unet_config \
-    --version $version_arg \
+    --version $version_ar"
 
 # Add realtime-specific arguments if in realtime mode
 if [ "$mode" = "realtime" ]; then
     cmd_args="$cmd_args \
     --fps 25 \
-    --version $version_arg \
+    --version $version_arg"
 fi
 
 # Run inference
-python3 -m $script_name $cmd_args
+python3 -m $script_name $cmd_args