Skip SC2015 when the last command is true

[Flu]

In cases like

#!/bin/sh
set -e
foo && bar || true

The last true is used for masking the return value, no matter if both foo and bar executed, therefore SC2015 has no relevance here.

Closes #2977

[SvenStaehs]

Thank you! Hope to see this included in the next release, we are due one any day now 😆
My use-case for the record:

#!/usr/bin/env bash
set -euo pipefail
[...]
for attempt in {3..0}; do
    [[ $attempt -gt 0 ]] || die "Failed to [do the thing]."
    # shellcheck disable=SC2015 # "break" never fails (I think), AND "true" has no side-effect, so this rule does not apply. See https://github.com/koalaman/shellcheck/issues/2977
    doSomethingFlaky && break || true
done