test: Fix the Requirement Checker terminal

[theofidry]

No description provided.

[theofidry]

To try:

diff --ignore-all-space --side-by-side --suppress-common-lines $(ORIGINAL_TERMINAL) src/Terminal.php > $@ || true

(and use $(DIFF) instead. Otherwise the issue can be the TTY, as diff or other commands may behave differently with an interactive terminal (e.g. to allow scrolling).

because of || true) > the redirect happens after so if the terminal is a TTY the output might be different. By doing the || true after, even if the terminal is TTY diff will behave as if it was not.