ANSI.erase erases the wrong side

[csos95]

The erase function states that it erases to the left of the cursor, but the escape code it returns uses the value for erasing to the right of the cursor.

fun erase(): String =>
    """
    Erases everything to the left of the cursor on the line the cursor is on.
    """
    "\x1B[0K"

Here's the definition of the erase in line escape code.

Code	Abbr	Name	Effect
CSI n K	EL	Erase in Line	Erases part of the line. If n is 0 (or missing), clear from cursor to the end of the line. If n is 1, clear from cursor to beginning of the line. If n is 2, clear entire line. Cursor position does not change.

Here's an example showing that it erases to the right of the cursor.

use "term"

actor Main
  new create(env: Env) =>
    env.out.print(ANSI.clear() + "12345678901234567890" + ANSI.cursor(10, 1) + ANSI.erase())

[SeanTAllen]

This seems like a fairly straightforward bug. Anyone who wants to can open a PR to correct the incorrect code. I don't think this requires additional discussion.