Fix oction displayed for draft pr

[wweqg]

Summary:

Fixes #109

Type of change:

• ✨ Enhancement

Changes Made:

Fix octicon and colour for the draft PR

Update the graphql schema to include isDraft field for the IssueModel fragment

Screenshots:

Before

After

Proposed Commit Message:

Let's update the octicon and its colour for the draft PR

Checklist:

• I have tested my changes thoroughly.
• - [ ] I have created tests for any new code files created in this PR or provided a link to a issue/PR that addresses this.
• I have added or modified code comments to improve code readability where necessary.
• I have updated the project's documentation as necessary.

[Echomo-Xinyu]

Thank you for the PR! I have tested it and it worked as desired!

Please update the branch to sync with main branch so that I may approve and merge it. Keep on the excellent work!