Remove "DEBUG OUTPUT:" from failing OCS API requests

[MorrisJobke]

Just some cleanup. There was never (at least not since I'm involved) an output behind this phrase. Also the code doesn't show anything.

[codecov]

Codecov Report

Merging #7760 into master will increase coverage by 0.05%.
The diff coverage is 0%.

@@ Coverage Diff @@## master #7760 +/- ##
============================================
+ Coverage 51.17% 51.22% +0.05% - Complexity 24959 24965 +6 
============================================
Files 1605 1607 +2 Lines 94950 94984 +34 Branches 1376 1376 ============================================
+ Hits 48588 48658 +70 + Misses 46362 46326 -36

Impacted Files	Coverage Δ	Complexity Δ
ocs/v1.php	0% <0%> (ø)	0 <0> (ø)	⬇️
lib/private/Security/CertificateManager.php	91.08% <0%> (-1%)	39% <0%> (ø)
apps/files_trashbin/lib/Trashbin.php	72.28% <0%> (-0.25%)	136% <0%> (ø)
...ps/user_ldap/composer/composer/autoload_static.php	0% <0%> (ø)	1% <0%> (ø)	⬇️
.../user_ldap/composer/composer/autoload_classmap.php	0% <0%> (ø)	0% <0%> (ø)	⬇️
apps/user_ldap/lib/AccessFactory.php	0% <0%> (ø)	2% <0%> (?)
apps/user_ldap/lib/ConnectionFactory.php	0% <0%> (ø)	2% <0%> (?)
lib/private/Server.php	81.55% <0%> (+0.11%)	134% <0%> (ø)	⬇️
lib/private/Files/Cache/Propagator.php	96.2% <0%> (+1.26%)	16% <0%> (ø)	⬇️
apps/files_trashbin/lib/Expiration.php	91.93% <0%> (+1.61%)	29% <0%> (ø)	⬇️
... and 1 more