fix: shell input Chinese char error

tools/shell/src/shellCommand.c

@@ -101,11 +101,8 @@ void shellInsertChar(SShellCmd *cmd, char *c, int32_t size) {
   /* update the values */
   cmd->commandSize += size;
   cmd->cursorOffset += size;
-  for (int i = 0; i < size; i++) {
-    taosMbToWchar(&wc, c + i, size);
-    cmd->screenOffset += taosWcharWidth(wc);
-    cmd->endOffset    += taosWcharWidth(wc);
-  }  
+  cmd->screenOffset += taosWcharWidth(wc);
+  cmd->endOffset    += taosWcharWidth(wc);
 #ifdef WINDOWS
 #else
   shellShowOnScreen(cmd);