Music Assistant: Fix strings.json (home-assistant#156188)

Co-authored-by: Artur Pragacz <[email protected]>

Author: OzGav

homeassistant/components/music_assistant/strings.json

@@ -17,17 +17,13 @@
         "description": "Do you want to add the Music Assistant server `{url}` to Home Assistant?",
         "title": "Discovered Music Assistant server"
       },
-      "init": {
+      "user": {
         "data": {
+          "url": "[%key:common::config_flow::data::url%]"
+        },
+        "data_description": {
           "url": "URL of the Music Assistant server"
         }
-      },
-      "manual": {
-        "data": {
-          "url": "URL of the Music Assistant server"
-        },
-        "description": "Enter the URL to your already running Music Assistant server. If you do not have the Music Assistant server running, you should install it first.",
-        "title": "Manually add Music Assistant server"
       }
     }
   },