Since one commit as been used for modify two files:

https://github.com/bmerinofe/metasploit-framework/commit/98c8c168034222f206701520889238595bac459f

Revert the commit can be a little painful, but you can try. On the other hand, this tip from @todb-r7 can be useful here too https://github.com/rapid7/metasploit-framework/pull/2178#issuecomment-22142061 ("but the easiest thing to do would be to create a new branch .....")

You can close this one and create a new pull request, but as @todb-r7 says, you will lose the file's commit history.