enable calls and bump Session to 1.8.0

package.json

@@ -2,7 +2,7 @@
   "name": "session-desktop",
   "productName": "Session",
   "description": "Private messaging from your desktop",
-  "version": "1.7.6",
+  "version": "1.8.0",
   "license": "GPL-3.0",
   "author": {
     "name": "Loki Project",

preload.js

@@ -38,7 +38,7 @@ window.isBehindProxy = () => Boolean(config.proxyUrl);
 window.lokiFeatureFlags = {
   useOnionRequests: true,
   useMessageRequests: false,
-  useCallMessage: false,
+  useCallMessage: true,
 };
 
 window.isBeforeVersion = (toCheck, baseVersion) => {