mkinitramfs.py: Search for busybox{.,-}static first

In currentl Tumbleweed, using busybox dynamic linked does not work. For
now let's check if we have busybox static first.

Fix: #51

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
diff --git a/virtme/mkinitramfs.py b/virtme/mkinitramfs.py
index 8fb2f0e..193f510 100644
--- a/virtme/mkinitramfs.py
+++ b/virtme/mkinitramfs.py
@@ -169,7 +169,7 @@
 def find_busybox(root, is_native) -> Optional[str]:
     for p in itertools.product(['usr/local', 'usr', ''],
                                ['bin', 'sbin'],
-                               ['', '-static', '.static']):
+                               ['-static', '.static', '']):
         path = os.path.join(root, p[0], p[1], 'busybox' + p[2])
         if os.path.isfile(path):
             return path