Allow to load define-options.sh two or more times

# define-options.sh
# - - -

Author: aiya000

define-options.sh

@@ -1,11 +1,11 @@
 #!/bin/bash
 
+# Defines default options for bash-toys commands.
+#
 # ```shell-session
 # $ source path/to/bash-toys/define-options.sh
 # ```
 
-[[ -n $BASH_TOYS_LOADED_DEFAULT_OPTIONS ]] && return
-
 dir="$(cd -- "$(dirname -- "${BASH_SOURCE:-$0}")" && pwd || exit 1)"
 
 # Set default values only if variables are not already set
@@ -15,5 +15,3 @@ dir="$(cd -- "$(dirname -- "${BASH_SOURCE:-$0}")" && pwd || exit 1)"
 [[ -z $BASH_TOYS_POMODORO_NOTIFICATION_MUSIC ]] && export BASH_TOYS_POMODORO_NOTIFICATION_MUSIC="$dir/assets/notify.mp3"
 [[ -z $BASH_TOYS_POMODORO_NOTIFICATION_DURATION ]] && export BASH_TOYS_POMODORO_NOTIFICATION_DURATION=5
 [[ -z $BASH_TOYS_BATCAT_OPTIONS ]] && export BASH_TOYS_BATCAT_OPTIONS=--number
-
-export BASH_TOYS_LOADED_DEFAULT_OPTIONS=true