Fix and clean up shipped config files

config/foot/foot.ini

@@ -20,7 +20,5 @@ primary-paste=none
 clipboard-paste=Shift+Insert Control+Shift+v XF86Paste
 
 [text-bindings]
-# Send Shift+Return as CSI-u so TUIs can distinguish it from Return.
 \x1b[13;2u=Shift+Return
-# Send Alt+Shift+Return as CSI-u so tmux can match M-S-Enter.
 \x1b[13;4u=Mod1+Shift+Return