Don't assume the location of PHPUnit coverage reports

[kasparsd]

In

wp-dev-lib/scripts/check-diff.sh

Lines 804 to 816 in 420f1ba

	if [ -n "$TRAVIS_PHPUNIT_CONFIG" ]; then
	phpunit $( if [ -n "$TRAVIS_PHPUNIT_CONFIG" ]; then echo -c "$TRAVIS_PHPUNIT_CONFIG"; fi ) $(coverage_clover)
	elif [ -n "$PHPUNIT_CONFIG" ]; then
	phpunit $( if [ -n "$PHPUNIT_CONFIG" ]; then echo -c "$PHPUNIT_CONFIG"; fi ) $(coverage_clover)
	else
	for project in $( find_phpunit_dirs ); do
	(
	cd "$project"
	phpunit --stop-on-failure $( if [ "$project" == "$INITIAL_DIR" ]; then coverage_clover; fi )
	)
	done
	fi
	cd "$PROJECT_DIR"

we pass $(coverage_clover) which is equal to --coverage-clover build/logs/clover.xml if can_generate_coverage_clover returns 1 which is the case whenever a Coveralls config file is found in the project root and coverage task is enabled.