[lldb] Fix initialization of LazyBool/bool variables m_overwrite/m_overwrite_lazy. NFCI.

This silences a GCC warning after
1f7b58f / D122680:

lldb/source/Commands/CommandObjectCommands.cpp:1650:22: warning: enum constant in boolean context [-Wint-in-bool-context]
 1650 |   bool m_overwrite = eLazyBoolCalculate;
      |                      ^~~~~~~~~~~~~~~~~~

Differential Revision: https://reviews.llvm.org/D123204

Author: mstorsjo

lldb/source/Commands/CommandObjectCommands.cpp

@@ -1480,7 +1480,7 @@ class CommandObjectCommandsScriptAdd : public CommandObjectParsed,
     std::string m_class_name;
     std::string m_funct_name;
     std::string m_short_help;
-    LazyBool m_overwrite_lazy;
+    LazyBool m_overwrite_lazy = eLazyBoolCalculate;
     ScriptedCommandSynchronicity m_synchronicity =
         eScriptedCommandSynchronicitySynchronous;
   };
@@ -1647,7 +1647,7 @@ class CommandObjectCommandsScriptAdd : public CommandObjectParsed,
   std::string m_cmd_name;
   CommandObjectMultiword *m_container = nullptr;
   std::string m_short_help;
-  bool m_overwrite = eLazyBoolCalculate;
+  bool m_overwrite = false;
   ScriptedCommandSynchronicity m_synchronicity =
       eScriptedCommandSynchronicitySynchronous;
 };