fixed issue #2729

[roottool]

Description

I fixed the position of the checkbox shifted to the right.
I diverted the value of margin-left from the following code in line 77 of browser/components/markdown.styl.

li
  label.taskListItem
    margin-left -1.8em

Sample code

# Sample text

- [ ] test


- Normal UL
- [ ] Checkbox
  - [ ] test
  - test
- [x] Checkbox2
- Normal UL
- test
  > Quote in list element
- text2

> Normal Quote

- [ ] text
  > Quote in checkbox

  - test
    - [ ] test 
    - test
- [ ] text2

Before

After

Issue fixed

#2729

Type of changes

• 🔘 Bug fix (Change that fixed an issue)
• ⚪ Breaking change (Change that can cause existing functionality to change)
• ⚪ Improvement (Change that improves the code. Maybe performance or development improvement)
• ⚪ Feature (Change that adds new functionality)
• ⚪ Documentation change (Change that modifies documentation. Maybe typo fixes)

Checklist:

• 🔘 My code follows the project code style
• ⚪ I have written test for my code and it has been tested
• ⚪ All existing tests have been passed
• 🔘 I have attached a screenshot/video to visualize my change if possible

[ZeroX-DG]

LGTM 🎉 Thank you for your contribution