Remove custom open/close icons

We currently specify both icons but both are 404s...

ccchh-template.json

@@ -11,12 +11,6 @@
     "lon": 9.9445899999999998,
     "lat": 53.55836
   },
-  "state": {
-    "icon": {
-      "open": "https://hamburg.ccc.de/dooris/open.png",
-      "closed": "https://hamburg.ccc.de/dooris/close.png"
-    }
-  },
   "contact": {
     "phone": "",
     "irc": "ircs://irc.hackint.org:9999/ccchh",

types/v14.go

@@ -14,10 +14,6 @@ type SpaceAPIResponseV14 struct {
 	State struct {
 		Open       bool  `json:"open"`
 		LastChange int64 `json:"lastchange"`
-		Icon       struct {
-			Closed string `json:"closed"`
-			Open   string `json:"open"`
-		} `json:"icon"`
 	} `json:"state"`
 	Contact struct {
 		Phone    string `json:"phone"`