Add tmux.conf as a bash file type (#9653)

* Add conf as a bash file type

Tmux and tmux.conf is used widely in software developer circles.

Having the tmux.conf file not have any syntax highlighting by default is (IMO) not ideal for an editor that otherwise "just works".

* Use tmux.conf glob instead of simply conf for tmux

Co-authored-by: Michael Davis <mcarsondavis@gmail.com>

---------

Co-authored-by: Michael Davis <mcarsondavis@gmail.com>

languages.toml

@@ -860,6 +860,7 @@ file-types = [
   "tcshrc",
   "bashrc_Apple_Terminal",
   "zshrc_Apple_Terminal",
+  { glob = "tmux.conf" },
   { glob = ".bash_history" },
   { glob = ".bash_login" },
   { glob = ".bash_logout" },