[OTA] Fix invalid json (#1568)

scripts/latest_version.json

@@ -1,5 +1,5 @@
 {
     "latest_version": "version_tag",
     "title": "OpenMQTTGateway",
-    "release_url": "https://github.com/1technophile/OpenMQTTGateway/releases/tag/version_tag",
+    "release_url": "https://github.com/1technophile/OpenMQTTGateway/releases/tag/version_tag"
 }

scripts/latest_version_dev.json

@@ -1,4 +1,4 @@
 {
     "latest_version": "version_tag",
-    "title": "OpenMQTTGateway Nightly (TEST ONLY)",
+    "title": "OpenMQTTGateway Nightly (TEST ONLY)"
 }