refactor!: initialize sane defaults, parse args

BREAKING CHANGE: the `-b` option has been changed to `-d` to make more
sense. i know changes like these may annoy users but i didn't want to
use a generic term like `--backend` for configuring dmenu programs.
`--backend` is also confusing because tessen supports two kinds of
backends now - pass backend and dmenu backend

the `tmp_opts` variable was declare before in the parse_config option as
a way to resolve a conflict when a user provides config files for rofi
and wofi and ends up choosing rofi or wofi explicitly from the
arguments. in that case, validate_backend would reset the list of
dmenu_backend_opts variable to its defaults without the config file
locations which are mentioned in the parse_config function

since we've parsed the `-c` option before in parse_config, the `-c`
option must be ignored in the main() function. we can't omit `-c`
because then a user would get incorrect arg specified error.

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