Update manifest.json to new URL

packages/lesspass-web-extension/extension/manifest.json

@@ -3,7 +3,7 @@
   "manifest_version": 2,
   "name": "LessPass",
   "version": "3.1.6",
-  "homepage_url": "https://github.com/lesspass/webextension",
+  "homepage_url": "https://github.com/lesspass/lesspass",
   "icons": {
     "64": "icons/logo-64.png"
   },
@@ -33,4 +33,4 @@
       "strict_min_version": "48.0"
     }
   }
-}
+}