Update dapp promotions file to set Ledger as first

[gtg7784]

Pull Request Summary

Update Ledger Promotion as first in dapp promotions file

Check list

• [ ] contains breaking changes
• [ ] adds new feature
• [ ] modifies existing feature (bug fix or improvements)
• [x] relies on other tasks
• [ ] documentation changes
• [ ] tested on mobile devices

This pull request makes the following changes:

Changes

• Update dapp_promotions.json to set Ledger Promotion as first

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 9fa938c):

https://astar-apps--pr1333-ledger-promotion-fir-i2f33r72.web.app

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