tmux: Undo TERM hacking

Undoes the hack introduced in 1136ef2
to fix the combination of Home/End keys, italics in Vim, and background
highlighting in Delta.

Fixes Home/End key regression in scratchpad terminal (#143).

"Just works" on Fedora, but on Ubuntu, it requires the ncurses-term
package to provide the tmux-256color termcap.

setup.d/000-base-packages-ubuntu.sh

@@ -11,6 +11,7 @@ if prompt_default_no "Install base system packages?"; then
         iperf
         make
         moreutils
+        ncurses-term
         net-tools
         nmap
         openssh-server

stowdir/.tmux.conf

@@ -64,16 +64,13 @@ bind-key C-a send-prefix
 bind-key C-l send-keys C-l
 bind-key l send-keys C-l
 
-set -g default-terminal xterm-256color
+# screen-256color and xterm-256color result in Vim italics shenanigans, as well as Home and End not
+# working in the shell, scratchpad, and Vim without extra hacks. Using tmux-256color requires the
+# ncurses-term package on Ubuntu.
+set -g default-terminal tmux-256color
 # Fix delta background colors
 # See: https://dandavison.github.io/delta/tips-and-tricks/using-delta-with-tmux.html
-set -ga terminal-overrides ",xterm-256color:Tc"
-# Fix Home/End keys not working with xterm-256color
-# Requires additional settings in my vimrc so that Vim doesn't insert an H or an F on the line above
-# the cursor ಠ_ಠ
-# See: https://stackoverflow.com/a/55616731
-bind-key -n Home send Escape "OH"
-bind-key -n End send Escape "OF"
+set -ga terminal-overrides ",*-256color:Tc"
 
 set -g set-titles on
 # Forward the pane's title on to the terminal

stowdir/.vim/vimrc

@@ -632,15 +632,6 @@ let test#strategy = "dispatch"
 " Keybinds
 """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
 
-" Handle tmux $TERM quirks in vim
-" See: https://stackoverflow.com/a/9674158
-if $TERM =~ '^screen-256color'
-    map <Esc>OH <Home>
-    map! <Esc>OH <Home>
-    map <Esc>OF <End>
-    map! <Esc>OF <End>
-endif
-
 " Turn off search highlighting with enter
 nnoremap <CR> :nohl<CR><CR>