fix config files

preprocessor_config.json

@@ -8,15 +8,15 @@
   "do_rescale": true,
   "do_resize": true,
   "image_mean": [
-    0.5,
-    0.5,
-    0.5
+    0.45,
+    0.45,
+    0.45
   ],
   "image_processor_type": "VideoMAEImageProcessor",
   "image_std": [
-    0.5,
-    0.5,
-    0.5
+    0.225,
+    0.225,
+    0.225
   ],
   "resample": 2,
   "rescale_factor": 0.00392156862745098,