tdf#146460 tdf#148429 ucb: webdav-curl: censor "curl" in UserAgent

This is now the second bug filed because a server replies with 403 if
the UserAgent contains the string "curl".

Change-Id: I25ca2d255af76a7ff4e64dad900b1bf0b78de59f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/133212
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

ucb/source/ucp/webdav-curl/CurlSession.cxx

@@ -618,9 +618,10 @@ CurlSession::CurlSession(uno::Reference<uno::XComponentContext> const& xContext,
     // en.wikipedia.org:80 forces back 403 "Scripts should use an informative
     // User-Agent string with contact information, or they may be IP-blocked
     // without notice" otherwise:
-    OString const useragent(OString::Concat("LibreOffice " LIBO_VERSION_DOTTED " curl/")
-                            + ::std::string_view(pVersion->version, strlen(pVersion->version)) + " "
-                            + pVersion->ssl_version);
+    OString const useragent(
+        OString::Concat("LibreOffice " LIBO_VERSION_DOTTED " denylistedbackend/")
+        + ::std::string_view(pVersion->version, strlen(pVersion->version)) + " "
+        + pVersion->ssl_version);
     // looks like an explicit "User-Agent" header in CURLOPT_HTTPHEADER
     // will override CURLOPT_USERAGENT, see Curl_http_useragent(), so no need
     // to check anything here