chore: switch Id definition (#135)

* switch Id definition

* fix

---------

Co-authored-by: Mario Carneiro <di.gama@gmail.com>

Author: Jlh18

GroupoidModel/ForMathlib/CategoryTheory/Yoneda.lean

@@ -8,20 +8,20 @@ notation:max "y(" Γ ")" => yoneda.obj Γ
 notation:max "ym(" f ")" => yoneda.map f
 
 open Lean PrettyPrinter in
-@[app_unexpander Prefunctor.obj]
-def Prefunctor.obj.unexpand : Unexpander
+@[app_unexpander Functor.obj]
+def Functor.obj.unexpand : Unexpander
   | `($_ $F $X) =>
-    if let .node _ _ #[.ident _ _ `yoneda _, _, .ident _ _ `toPrefunctor _] := F.raw then
+    if let .ident _ _ `yoneda _ := F.raw then
       `(y($X))
     else
       throw ()
   | _ => throw ()
 
 open Lean PrettyPrinter in
-@[app_unexpander Prefunctor.map]
-def Prefunctor.map.unexpand : Unexpander
+@[app_unexpander Functor.map]
+def Functor.map.unexpand : Unexpander
   | `($_ $F $X) =>
-    if let .node _ _ #[.ident _ _ `yoneda _, _, .ident _ _ `toPrefunctor _] := F.raw then
+    if let .ident _ _ `yoneda _ := F.raw then
       `(ym($X))
     else
       throw ()