Fix other.test_install after two PRs raced to land. NFC (#25969)

Author: sbc100

test/test_other.py

@@ -15113,7 +15113,7 @@ def test_parsetools_make_removed_fs_assert(self):
   @requires_git_checkout
   def test_install(self):
     self.run_process([PYTHON, path_from_root('tools/install.py'), 'newdir'], env=shared.env_with_node_in_path())
-    self.assertExists(utils.bat_suffix('newdir/emcc'))
+    self.assertExists('newdir/emcc.py')
     # Some files, such as as maintenance tools should not be part of the
     # install.
     self.assertNotExists('newdir/tools/maint/')