Increase boldness of unread files in pull-requests diff view

Issue Summary

Increase boldness of unread files in pull-requests diff view

Steps to Reproduce

Not Available

Expected Results

Increasing boldness of unread files in pull-requests view helps to identify them easily.

Actual Results

With current font, it is little difficult to identify unread files on the older versions of Windows OS

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available