[LLDB] Fix wrong argument in CommandObjectThreadStepWithTypeAndScope

[aganea]

Summary

This fixes a warning on MSVC:

F:\llvm-project\lldb\source\Commands\CommandObjectThread.cpp(529): warning C4305: 'argument': truncation from 'char' to 'bool'

Previously, 'C' was passed into the wrong parameter, as is_class was introduced in D68671:

OptionGroupPythonClassWithDict(const char *class_use,
                               bool is_class = true,
                               int class_option = 'C',

[shafik]

lldb/source/Commands/CommandObjectThread.cpp

529

We could also leave out both true and C since both are already defaulted to these values.

[aganea]

Omit default arguments.

[aganea]

This is a trivial change, unless you have any objections, I'll go forward with this.

[jingham]

Looks right, thanks for catching this.

lldb/source/Commands/CommandObjectThread.cpp

CommandObjectThreadStepWithTypeAndScope(CommandInterpreter &interpreter,
                                           StepType step_type,
                                           StepScope step_scope)
       : CommandObjectParsed(interpreter, name, help, syntax,
                             eCommandRequiresProcess | eCommandRequiresThread |
                                 eCommandTryTargetAPILock |
                                 eCommandProcessMustBeLaunched |
                                 eCommandProcessMustBePaused),
         m_step_type(step_type), m_step_scope(step_scope), m_options(),
-        m_class_options("scripted step", 'C') {
+        m_class_options("scripted step") {
     CommandArgumentEntry arg;
     CommandArgumentData thread_id_arg;
 
     // Define the first (and only) variant of this arg.
     thread_id_arg.arg_type = eArgTypeThreadID;
     thread_id_arg.arg_repetition = eArgRepeatOptional;
 
     // There is only one variant this argument could be; put it into the