Update conv3d.pbtxt

Author: bjjwwang

paddle/fluid/operators/compat/conv3d.pbtxt

@@ -29,6 +29,10 @@ def {
     name: "dilations"
     type: INTS
   }
+  attrs {
+    name: "data_format"
+    type: STRING
+  }
 }
 extra {
   inputs {
@@ -86,10 +90,6 @@ extra {
     name: "force_fp32_output"
     type: BOOLEAN
   }
-  attrs {
-    name: "data_format"
-    type: STRING
-  }
   attrs {
     name: "workspace_size_MB"
     type: INT