Fix $DRACULA_ARROW_ICON getting parsed as a command-line flag to print

[speelbarrow]

When $DRACULA_ARROW_ICON begins with an unescaped - character, it will be read as a command line flag by the print command. This causes the error dracula_arrow:print:2: bad option: -> (for example) to get outputted on each new prompt line. This PR passes the -- flag to print before passing $DRACULA_ARROW_ICON to ensure that print does not attempt to parse the arrow icon as a command-line flag.

If you're fixing a UI issue, make sure you take two screenshots. One that shows the actual bug and another that shows how you fixed it.

Before:

After:

Note: the literal string value of $DRACULA_ARROW_ICON in this context is -> , I'm using a font with ligatures that merges those two first characters into one symbol.