feat(sign): optimize default signature verification efficiency (#5396)

Author: lurais

framework/src/main/java/org/tron/core/config/args/Args.java

@@ -824,7 +824,7 @@ public static void setParam(final String[] args, final String confFileName) {
     PARAMETER.validateSignThreadNum =
         config.hasPath(Constant.NODE_VALIDATE_SIGN_THREAD_NUM) ? config
             .getInt(Constant.NODE_VALIDATE_SIGN_THREAD_NUM)
-            : (Runtime.getRuntime().availableProcessors() + 1) / 2;
+            : Runtime.getRuntime().availableProcessors();
 
     PARAMETER.walletExtensionApi =
         config.hasPath(Constant.NODE_WALLET_EXTENSION_API)