QtiV2/In: Fix incorrect imageclozeassociationV2 image path

Where image paths in the QTI source were in sub-directories, we had
a problem with compatibility with Learnosity's Data API asset upload
endpoint. The correct path needs to be:

`https://assets.learnosity.com/organisations/[organisation_id]/[filename]`

The problem was if images were stored in sub-directories in the QTI
source, that sub-directory would form an extra part of the file path,
thus breaking once uploaded via Data API.

Author: michaelsharman

src/Processors/QtiV2/In/Interactions/GraphicGapMatchInteractionMapper.php

@@ -6,6 +6,7 @@
 use LearnosityQti\Entities\QuestionTypes\imageclozeassociationV2_image;
 use LearnosityQti\Entities\QuestionTypes\imageclozeassociationV2_response_containers_item;
 use LearnosityQti\Exceptions\MappingException;
+use LearnosityQti\Processors\QtiV2\In\Constants;
 use LearnosityQti\Processors\QtiV2\In\Validation\GapMatchInteractionValidationBuilder;
 use LearnosityQti\Utils\QtiCoordinateUtil;
 use LearnosityQti\Utils\QtiMarshallerUtil;
@@ -32,7 +33,11 @@ public function getQuestionType()
         $associableHotspots = $this->buildTemplate($interaction, $imageObject);
 
         $image = new imageclozeassociationV2_image();
-        $image->set_src($imageObject->getData());
+        // Make sure to have the Learnosity base asset URL, with the organisation_id, then the filename.
+        // Nothing else should be in the path
+        $imageArray = explode('/',$imageObject->getData());
+        $imageBaseUrl = Constants::$baseLearnosityAssetsUrl . $this->organisationId . '/' . end($imageArray);
+        $image->set_src($imageBaseUrl);
         $image->set_width($imageObject->getWidth());
         $image->set_height($imageObject->getHeight());