use new $ dune ocaml top in tests

Signed-off-by: Rudi Grinberg <me@rgrinberg.com>

Author: rgrinberg

test/blackbox-tests/test-cases/toplevel-integration.t/run.t

@@ -14,15 +14,15 @@ Test toplevel-init-file on a tiny project
   > let hello () = print_endline "hello"
   > EOF
 
-  $ dune top
+  $ dune ocaml top
   #directory "$TESTCASE_ROOT/_build/default/.test.objs/byte";;
   #directory "$TESTCASE_ROOT/_build/default/.test.objs/native";;
   #load "$TESTCASE_ROOT/_build/default/test.cma";;
 
   $ ocaml -stdin <<EOF
   > #use "topfind";;
   > #use "use_output_compat";;
-  > #use_output "dune top";;
+  > #use_output "dune ocaml top";;
   > Test.Main.hello ();;
   > EOF
   hello
@@ -31,7 +31,7 @@ Test toplevel-init-file on a tiny project
   > let oops () = undefined_function ()
   > EOF
 
-  $ dune top
+  $ dune ocaml top
   File "error.ml", line 1, characters 14-32:
   1 | let oops () = undefined_function ()
                     ^^^^^^^^^^^^^^^^^^
@@ -41,7 +41,7 @@ Test toplevel-init-file on a tiny project
   $ ocaml -stdin <<EOF
   > #use "topfind";;
   > #use "use_output_compat";;
-  > #use_output "dune top";;
+  > #use_output "dune ocaml top";;
   > EOF
   File "error.ml", line 1, characters 14-32:
   1 | let oops () = undefined_function ()