all.sh: Perform targeted EtM tests for MAC-less configs

When testing a configuration where no ciphersuites have MAC, via
component_test_when_no_ciphersuites_have_mac(), perform a targeted test
of only encrypt-then-MAC tests within ssl-opt.sh.
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 3d94bc8..6b0a13b 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -894,7 +894,7 @@
     make test
 
     msg "test ssl-opt.sh: !MBEDTLS_SSL_SOME_MODES_USE_MAC"
-    if_build_succeeded tests/ssl-opt.sh
+    if_build_succeeded tests/ssl-opt.sh -f 'Default\|EtM' -e 'without EtM'
 }
 
 component_test_null_entropy () {