assets/save: Fix sourceforge git repository URL validation
The assumption that URL paths to git repos for the git.code.sf.net
netloc are necessarily prefixed by /p/ is wrong.
Related to T3690
Migrated from D6551 (view on Phabricator)
The assumption that URL paths to git repos for the git.code.sf.net
netloc are necessarily prefixed by /p/ is wrong.
Related to T3690
Migrated from D6551 (view on Phabricator)