Adapt ssl-opt.sh to modified ciphersuite log format

The debug output for supported ciphersuites has been changed
from `deadbeef` to `0xdeadbeef` in a previous commit, but the
test script `ssl-opt.sh` grepping for lines in the debug log
to determine test success/failure hadn't been adjusted accordingly.

This commit fixes this.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 5864a87..e7849cd 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -5745,7 +5745,7 @@
             "$P_SRV debug_level=3" \
             "$P_CLI debug_level=3" \
             0 \
-            -C "add ciphersuite: c0ff" \
+            -C "add ciphersuite: 0xc0ff" \
             -C "adding ecjpake_kkpp extension" \
             -S "found ecjpake kkpp extension" \
             -S "skip ecjpake kkpp extension" \
@@ -5760,7 +5760,7 @@
             "$P_CLI debug_level=3 ecjpake_pw=bla \
              force_ciphersuite=TLS-ECJPAKE-WITH-AES-128-CCM-8" \
             1 \
-            -c "add ciphersuite: c0ff" \
+            -c "add ciphersuite: 0xc0ff" \
             -c "adding ecjpake_kkpp extension" \
             -s "found ecjpake kkpp extension" \
             -s "skip ecjpake kkpp extension" \
@@ -5775,7 +5775,7 @@
             "$P_CLI debug_level=3 ecjpake_pw=bla \
              force_ciphersuite=TLS-ECJPAKE-WITH-AES-128-CCM-8" \
             0 \
-            -c "add ciphersuite: c0ff" \
+            -c "add ciphersuite: 0xc0ff" \
             -c "adding ecjpake_kkpp extension" \
             -C "re-using cached ecjpake parameters" \
             -s "found ecjpake kkpp extension" \