Fix reading blob data as resource

PostgreSQL returns data as resource when using IQueryBuilder::PARAM_LOB
(which is used for QBMapper).

Previously we just converted this resource using settype, which produced
things like "Resource id #14" instead of the actual resource data.

Now we read the stream correctly if the returned data is a resource

See context at #22472

Fixes #22439

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/public/AppFramework/Db/Entity.php

@@ -113,6 +113,9 @@ protected function setter($name, $args) {
 				$type = $this->_fieldTypes[$name];
 				if ($type === 'blob') {
 					// (B)LOB is treated as string when we read from the DB
+					if (is_resource($args[0])) {
+						$args[0] = stream_get_contents($args[0]);
+					}
 					$type = 'string';
 				}