Remove invalid -l option from test scripts

The -l option mentioned in previous commits for both ssl-opt.sh and
compat.sh scripts should only be a --list-test-cases option.

Remove -l option from the help list.

Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>
diff --git a/tests/compat.sh b/tests/compat.sh
index 570c8e8..f55bb0e 100755
--- a/tests/compat.sh
+++ b/tests/compat.sh
@@ -127,7 +127,7 @@
     printf "            \tAlso available: GnuTLS (needs v3.2.15 or higher)\n"
     printf "  -M|--memcheck\tCheck memory leaks and errors.\n"
     printf "  -v|--verbose\tSet verbose output.\n"
-    printf "  -l|--list-test-cases\tList all potential test cases (No Execution)\n"
+    printf "     --list-test-cases\tList all potential test cases (No Execution)\n"
     printf "     --outcome-file\tFile where test outcomes are written\n"
     printf "                   \t(default: \$MBEDTLS_TEST_OUTCOME_FILE, none if empty)\n"
     printf "     --preserve-logs\tPreserve logs of successful tests as well\n"