selftests: remove the LSM_ID_IMA check in lsm/lsm_list_modules_test

The IMA LSM ID token was removed as IMA isn't yet a proper LSM, but
we forgot to remove the check from the selftest.

Reported-by: kernel test robot <[e-mail]>
Closes: https://lore.kernel.org/r/[e-mail]/
Acked-by: Casey Schaufler <[e-mail]>
Signed-off-by: Paul Moore <[e-mail]>

tools/testing/selftests/lsm/lsm_list_modules_test.c

···
 		case LSM_ID_TOMOYO:
 			name = "tomoyo";
 			break;
-		case LSM_ID_IMA:
-			name = "ima";
-			break;
 		case LSM_ID_APPARMOR:
 			name = "apparmor";
 			break;