ignore duplicate setting sections
ignore duplicate setting sections

this prevents some 'Section with the same ID already registered' errors in the log

also includes an improvement of the error message to make other cases easier to find

Signed-off-by: Robin Appelman <474ee9ee179b0ecf0bc27408079a0b15eda4c99d@icewind.nl>

andreas-p/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server,nextcloud/server