Remove an unused variable and explicitly initialize some bools to false

Signed-off-by: Daniel Edwards <dev@danieledwards.de>

Code/Editor/Settings.cpp

@@ -1084,7 +1084,7 @@ void SEditorSettings::SaveSettingsRegistryFile()
         return;
     }
 
-    [[maybe_unused]] bool saved{};
+    [[maybe_unused]] bool saved = false;
     constexpr auto configurationMode = AZ::IO::SystemFile::SF_OPEN_CREATE
         | AZ::IO::SystemFile::SF_OPEN_CREATE_PATH
         | AZ::IO::SystemFile::SF_OPEN_WRITE_ONLY;