Remove useless Back button from Finished dialog.

PCbuild/python20.wse

@@ -2243,17 +2243,6 @@ item: Custom Dialog Set
       Text Spanish=&Terminar
       Text Italian=&Fine
     end
-    item: Push Button
-      Rectangle=105 187 150 202
-      Variable=DISABLED
-      Value=!
-      Create Flags=01010000000000010000000000000000
-      Text=< &Back
-      Text French=< &Retour
-      Text German=< &Zurck
-      Text Spanish=< &Atrs
-      Text Italian=< &Indietro
-    end
     item: Push Button
       Rectangle=211 187 256 202
       Variable=DISABLED
@@ -2266,11 +2255,6 @@ item: Custom Dialog Set
       Text Spanish=&Cancelar
       Text Italian=&Annulla
     end
-    item: Static
-      Rectangle=8 180 256 181
-      Action=3
-      Create Flags=01010000000000000000000000000111
-    end
     item: Static
       Rectangle=86 8 258 42
       Create Flags=01010000000000000000000000000000
@@ -2302,6 +2286,11 @@ item: Custom Dialog Set
       Text Italian=
       Text Italian=Premere il pulsante Fine per uscire dall'installazione.
     end
+    item: Static
+      Rectangle=8 180 256 181
+      Action=3
+      Create Flags=01010000000000000000000000000111
+    end
   end
 end
 item: End Block