Removed deprecated Besu param.

Author: 0xfornax

install/scripts/start-ec.sh

@@ -266,7 +266,7 @@ if [ "$CLIENT" = "besu" ]; then
             --engine-rpc-port=${EC_ENGINE_PORT:-8551} \
             --engine-host-allowlist=* \
             --engine-jwt-secret=/secrets/jwtsecret \
-            --Xsnapsync-synchronizer-flat-db-healing-enabled=true \
+            --Xbonsai-full-flat-db-enabled=true \
             $EC_ADDITIONAL_FLAGS"
 
         if [ "$BESU_ARCHIVE_MODE" = "true" ]; then