fix: incorrect "description_localizations" key's value build in CommandOptionBuilder

[priyanuj-gogoi]

Description

Fixes a bug with slash command localization (particularly in sub-commands).

When both localization name & description are set, the localization description uses the value of localization name which leads the slash command to have same localization name & description values.

Example

final command = ChatGroup(
  'name',
  '.',
  localizedNames: { Locale.hi: 'नेम' },
  children: [
    ChatCommand(
      'sub_name',
      'sub_description',
      localizedNames: { Locale.hi: 'सब_नेम' },
      localizedDescriptions: { Locale.hi: 'सब_डिस्क्रिप्शन' },
      id('sub_name', (ChatContext ctx) async {
        await ctx.respond(MessageBuilder(content: 'Meow!'));
      })
    )
  ]
);

Preview output

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• Ran dart analyze or make analyze and fixed all issues
• Ran dart format --set-exit-if-changed -l 160 ./lib or make format and fixed all issues
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[abitofevrything]

Thanks!