bpo-33053: Remove test_cmd_line_script debugging print (GH-6237)

I noticed this had slipped into the original commit when
resolving a merge conflict for the backport to 3.7.
diff --git a/Lib/test/test_cmd_line_script.py b/Lib/test/test_cmd_line_script.py
index 1762008..a9c1309 100644
--- a/Lib/test/test_cmd_line_script.py
+++ b/Lib/test/test_cmd_line_script.py
@@ -125,8 +125,6 @@
             script_exec_args = [script_exec_args]
         run_args = [*support.optim_args_from_interpreter_flags(),
                     *cmd_line_switches, *script_exec_args, *example_args]
-        if env_vars:
-            print(env_vars)
         rc, out, err = assert_python_ok(
             *run_args, __isolated=False, __cwd=cwd, **env_vars
         )