[lldb] Fix command line of target frame-provider register (#167803)

So far, the syntax was `target frame-provider register <cmd-options>
[<run-args>]`. Note the optional `run-args` at the end. They are
completely ignored by the actual command, but the command line parser
still accepts them.

This commit removes them.

This was probably a copy-paste error from `CommandObjectProcessLaunch`
which was probably used as a blue-print for `target frame-provider
register`.

lldb/source/Commands/CommandObjectTarget.cpp

@@ -5420,8 +5420,6 @@ public:
     m_all_options.Append(&m_class_options, LLDB_OPT_SET_1 | LLDB_OPT_SET_2,
                          LLDB_OPT_SET_ALL);
     m_all_options.Finalize();
-
-    AddSimpleArgumentList(eArgTypeRunArgs, eArgRepeatOptional);
   }
 
   ~CommandObjectTargetFrameProviderRegister() override = default;
@@ -5434,7 +5432,7 @@ public:
   }
 
 protected:
-  void DoExecute(Args &launch_args, CommandReturnObject &result) override {
+  void DoExecute(Args &command, CommandReturnObject &result) override {
     ScriptedMetadataSP metadata_sp = std::make_shared<ScriptedMetadata>(
         m_class_options.GetName(), m_class_options.GetStructuredData());