Respect browse-url-default-scheme on Haiku

* lisp/net/browse-url.el (browse-url-default-haiku-browser): Respect
'browse-url-default-scheme', which currently defaults to "http".
1 job for master in 3 minutes and 30 seconds (queued for 9 seconds)
Status Job ID Name Coverage
  Normal
failed #75977
test-lisp-net-inotify

00:03:30

 
Name Stage Failure
failed
test-lisp-net-inotify Normal
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
$ find ${test_name} -type d -depth -exec rmdir {} + 2>/dev/null
Uploading artifacts...
test-lisp-net-inotify-0ce068c2/: found 27 matching files
Uploading artifacts to coordinator... ok
id=75977 responseStatus=201 Created token=3gu8brXw
Uploading artifacts...
test-lisp-net-inotify-0ce068c2/junit-test-report.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=75977 responseStatus=201 Created token=3gu8brXw
ERROR: Job failed: exit code 2