smoketest: T8146: add recovery key confirmation

Author: MattKobayashi

scripts/check-qemu-install

@@ -661,6 +661,8 @@ try:
         c.sendline('n')
         c.expect('Enter recovery key: ')
         c.sendline(test_recovery_key)
+        c.expect('Confirm key: ')
+        c.sendline(test_recovery_key)
         c.expect('Enter size of encrypted config partition.*', timeout=30)
         c.sendline('32')
         c.expect('Encrypted config volume has been enabled', timeout=tpm_timeout)