[lldb] Fix declaration of thread argument in CommandObjectThreadStepWithTypeAndScope (#95146)

`thread step-in` (and other step commands) take a `<thread-index>`, not a `<thread-id>`.

Author: kastiglione

lldb/source/Commands/CommandObjectThread.cpp

@@ -383,7 +383,7 @@ class CommandObjectThreadStepWithTypeAndScope : public CommandObjectParsed {
                                 eCommandProcessMustBePaused),
         m_step_type(step_type), m_step_scope(step_scope),
         m_class_options("scripted step") {
-    AddSimpleArgumentList(eArgTypeThreadID, eArgRepeatOptional);
+    AddSimpleArgumentList(eArgTypeThreadIndex, eArgRepeatOptional);
 
     if (step_type == eStepTypeScripted) {
       m_all_options.Append(&m_class_options, LLDB_OPT_SET_1 | LLDB_OPT_SET_2,