incus: fix log in sftpRecursiveMkdir

[J0nasDotDev]

Resolves: #2994

Before:

$ echo "Hello" > baz
$ incus file push baz c1/foo/bar/ -p
ERROR  [2026-03-13T16:54:31+01:00] Creating foo (directory)                     
ERROR  [2026-03-13T16:54:31+01:00] Creating foo/bar (directory)                 
$ incus file create c1/foo2/bar/buz -p
ERROR  [2026-03-13T16:54:45+01:00] Creating foo2 (directory)                    
ERROR  [2026-03-13T16:54:45+01:00] Creating foo2/bar (directory)  

After:

$ incus file push baz c1/foo/bar/ -p
$ incus file create c1/foo2/bar/buz -p    

With --verbose :

$ incus file push baz c1/foo/bar/ -p --verbose 
INFO   [2026-03-13T17:02:32+01:00] Creating foo (directory)                     
INFO   [2026-03-13T17:02:32+01:00] Creating foo/bar (directory)                 
INFO   [2026-03-13T17:02:32+01:00] Pushing baz to foo/bar/baz (file)            
$ incus file create c1/foo2/bar/buz -p --verbose 
INFO   [2026-03-13T17:02:40+01:00] Creating foo2 (directory)                    
INFO   [2026-03-13T17:02:40+01:00] Creating foo2/bar (directory)