Update quill_screen.dart, i chaged the logic for showing a lock when …

…in edit mode and showing edit icon when in lock mode

Description

This pull request updates the logic in the library's example to enhance the user experience when toggling between edit and read-only modes. The following changes have been made:

Edit Mode: The UI now displays a lock icon when in edit mode, allowing users to switch to read-only mode easily. Read-Only Mode: Conversely, when in read-only mode, the UI displays an edit icon, enabling users to switch back to edit mode. These changes improve the clarity and functionality of the mode-switching mechanism, making it more intuitive for users.

Related Issues

[ ] ✨ New feature: Adds new functionality without breaking existing features.
[x ] 🛠️ Bug fix: Resolves an issue without altering current behavior.
[ ] 🧹 Code refactor: Code restructuring that does not affect behavior.
[ ] ❌ Breaking change: Alters existing functionality and requires updates.
[ ] 🧪 Tests: Adds new tests or modifies existing tests.
[ ] 📝 Documentation: Updates or additions to documentation.
[ ] 🗑️ Chore: Routine tasks, or maintenance.
[ ] ✅ Build configuration change: Changes to build or deploy processes.

Suggestions

None at this time.

singerdmx / flutter-quill