MAINTAINERS: update location of Python libraries

Commit 8f8fd9e introduced the python directory structure, but forgot
to update the path pattern on the MAINTAINERS file.

Signed-off-by: Cleber Rosa <crosa@redhat.com>

MAINTAINERS

@@ -2001,7 +2001,7 @@ Python scripts
 M: Eduardo Habkost <ehabkost@redhat.com>
 M: Cleber Rosa <crosa@redhat.com>
 S: Odd fixes
-F: scripts/qmp/*
+F: python/qemu/*py
 F: scripts/*.py
 F: tests/*.py