test/py: Quote consistency

When converting test/py from " to ', I missed a few places (or added a
few inconsistencies later). Fix these.

Note that only quotes in code are converted; double-quotes in comments
and HTML are left as-is, since English and HTML use " not '.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/py/tests/test_shell_basics.py b/test/py/tests/test_shell_basics.py
index 32e5f83..702e5e2 100644
--- a/test/py/tests/test_shell_basics.py
+++ b/test/py/tests/test_shell_basics.py
@@ -31,7 +31,7 @@
 def test_shell_run(u_boot_console):
     """Test the "run" shell command."""
 
-    u_boot_console.run_command('setenv foo \"setenv monty 1; setenv python 2\"')
+    u_boot_console.run_command('setenv foo "setenv monty 1; setenv python 2"')
     u_boot_console.run_command('run foo')
     response = u_boot_console.run_command('echo $monty')
     assert response.strip() == '1'