align more OCS error responses with oc10

[butonic]

We aligned more OCS error responses with oc10

see owncloud/ocis#1799

a curl -X POST -u admin:admin https://cloud.ocis.test/ocs/v1.php/apps/files_sharing/api/v1/shares -d shareType=3 -d path=nonExisting -v -k now returns

< HTTP/2 200 
< content-type: text/xml; charset=utf-8
< date: Tue, 27 Sep 2022 15:34:43 GMT
< ocs-api-version: 1
< vary: Origin
< content-length: 175
< 
<?xml version="1.0" encoding="UTF-8"?>
* Connection #0 to host cloud.ocis.test left intact
<ocs><meta><status>failure</status><statuscode>404</statuscode><message>Wrong path, file/folder doesn&#39;t exist</message></meta></ocs>