deprecate ui.date_style and ui.time_style

these have been unused since date/time formatting has been pushed to i18n

web/public/locales/en/config/global.json

@@ -270,14 +270,6 @@
       "label": "Time format",
       "description": "Time format to use in the UI (browser, 12hour, or 24hour)."
     },
-    "date_style": {
-      "label": "Date style",
-      "description": "Date style to use in the UI (full, long, medium, short)."
-    },
-    "time_style": {
-      "label": "Time style",
-      "description": "Time style to use in the UI (full, long, medium, short)."
-    },
     "unit_system": {
       "label": "Unit system",
       "description": "Unit system for display (metric or imperial) used in the UI and MQTT."

web/public/locales/en/views/settings.json

@@ -1852,12 +1852,6 @@
       "12hour": "12 hour",
       "24hour": "24 hour"
     },
-    "TimeOrDateStyle": {
-      "full": "Full",
-      "long": "Long",
-      "medium": "Medium",
-      "short": "Short"
-    },
     "unitSystem": {
       "metric": "Metric",
       "imperial": "Imperial"