don't save images with full URL, just path is enough (#56)

Signed-off-by: Jakub Sokołowski <jakub@status.im>

back-end/services/dapp-image-service.js

@@ -24,7 +24,7 @@ class DAppImageService {
 }
 
 const buildImageUrl = function (req, imageHash) {
-    return `${req.protocol}://${req.headers.host}${req.originalUrl}/image/${imageHash}`;
+    return `/metadata/image/${imageHash}`;
 }
 
 module.exports = DAppImageService;