Clean up strings.json (#52202)

* Remove empty error in arcam_fmj

* Remove empty data in directv

* Remove empty error and data in kraken

* Remove empty data in roku

homeassistant/components/arcam_fmj/strings.json

@@ -5,7 +5,6 @@
       "already_in_progress": "[%key:common::config_flow::abort::already_in_progress%]",
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]"
     },
-    "error": {},
     "flow_title": "{host}",
     "step": {
       "confirm": {

homeassistant/components/directv/strings.json

@@ -3,7 +3,6 @@
     "flow_title": "{name}",
     "step": {
       "ssdp_confirm": {
-        "data": {},
         "description": "Do you want to set up {name}?"
       },
       "user": {

homeassistant/components/kraken/strings.json

@@ -3,10 +3,8 @@
         "abort": {
             "already_configured": "[%key:common::config_flow::abort::single_instance_allowed%]"
         },
-        "error": {},
         "step": {
             "user": {
-                "data": {},
                 "description": "[%key:common::config_flow::description::confirm_setup%]"
             }
         }

homeassistant/components/roku/strings.json

@@ -10,8 +10,7 @@
       },
       "discovery_confirm": {
         "title": "Roku",
-        "description": "Do you want to set up {name}?",
-        "data": {}
+        "description": "Do you want to set up {name}?"
       }
     },
     "error": {