Add cmdh call to Fish shell default fallback function

Fish shell contains a `fish_command_not_found` function that is run when the executed command can't be found. Adding `cmdh` to the function call would allow the command to be found successfully even if the shell fails to find the command.

https://fishshell.com/docs/current/cmds/fish_command_not_found.html

See: https://github.com/jmorganca/ollama/pull/1595