fix: default value for the time format should be empty

[palkx]

Hello guys.

I've been using your theme for a while already and I've noticed that all time based options are not getting applied.
I've checked source code for the dracula.sh and I've noticed that option @dracula-time-format has a default value.

If we check time plugin source code we'll notice that if time_format isn't empty then it'll be used instead of the theme provided formats:

    elif [ $plugin = "time" ]; then
      IFS=' ' read -r -a colors <<< $(get_tmux_option "@dracula-time-colors" "dark_purple white")
      if [ -n "$time_format" ]; then # Time format condition right here
        script=${time_format}
      else
        if $show_day_month && $show_military ; then # military time and dd/mm
          script="%a %d/%m %R ${timezone} "
        elif $show_military; then # only military time
          script="%a %m/%d %R ${timezone} "
        elif $show_day_month; then # only dd/mm
          script="%a %d/%m %I:%M %p ${timezone} "
        else
          script="%a %m/%d %I:%M %p ${timezone} "
        fi
      fi

The problem is even if I specify an empty value for the @dracula-time-format option - script will use a default value. This means that this theme will always use a custom time format specified, ignoring all other options.

Please see the following screenshots:

1. What theme is showing by default right now:
   
2. What it should show by default:
   

Thanks!

[ethancedwards8]

Good catch. Thanks.

[pataquets]

I think this applies also to #200. Looks like default values should be used with care, I guess.
/cc @miknikif @ethancedwards8