Preserve last column with erase in line right

When the erase in line escape sequence with a parameter of 0 (right) is
passed while the wrapline flag is already set, it will no longer clear
the last column and instead ignore the operation.

The behavior of `\e[1K` and `\e[2K` is unchanged and both will clear the
entire first line without clearing the wrapline flag.

Closes #6159.

alacritty_terminal/tests/ref/erase_in_line/config.json

@@ -0,0 +1 @@
+{"history_size":0}