Fix Report-Msgid-Bugs-To in exported .po headers

The superfluous “\n” at the end of the first Report-Msgid-Bugs-To line
causes .po headers to get reordered. If the next line continues the first,
then it should not end with “\n”.

Additionally, switch the link to HTTPS and correct the product name
(it’s “Glom”, not “glom”).

https://bugzilla.gnome.org/show_bug.cgi?id=783851