Remove redundant SSL protocol keyword

Author: HTHou

iotdb-client/cli/src/main/java/org/apache/iotdb/cli/AbstractCli.java

@@ -161,7 +161,6 @@ static void init() {
     keywordSet.add("-" + TRUST_STORE_ARGS);
     keywordSet.add("-" + TRUST_STORE_PWD_ARGS);
     keywordSet.add("-" + SSL_PROTOCOL_ARGS);
-    keywordSet.add("--" + SSL_PROTOCOL_ARGS);
     keywordSet.add("-" + EXECUTE_ARGS);
     keywordSet.add("-" + ISO8601_ARGS);
     keywordSet.add("-" + RPC_COMPRESS_ARGS);