GIT_SILENT wallpapers/Next: update metadata.json for 5.26

(cherry picked from commit 251e60a726e645d5454bf916904216932df5ca6c)

wallpapers/Next/metadata.json

+{
+    "KPlugin": {
+        "Authors": [
+            {
+                "Email": "universalemail.gm@gmail.com",
+                "Name": "ruvkr"
+            }
+        ],
+        "Id": "Next",
+        "License": "CC-BY-SA-4.0",
+        "Name": "Kay"
+    }
+}