Import from Safari does not allow .md file upload

[lukehoersten]

Describe the bug

When importing from Safari, the file upload dialog box does not allow for selecting other file extensions than .txt so .md doesn't work.

Steps to reproduce (if necessary)

Steps to reproduce the behavior:
From Safari:

1. Go to 'Import posts'
2. Click on 'Choose files'
3. Try to select a markdown file

In Firefox, the file upload dialog has a way to disregard the site-specific file type. Safari does not.

Expected behavior

I should be able to select a .md markdown file to import.

Version or last commit:

Latest

[thebaer]

Thanks for the report, @lukehoersten! Does anyone familiar with Safari have ideas on some workarounds here? Maybe some JS-based browser detection?