use deltachat icon for chats entry in tabbar <3

deltachat-ios/Assets.xcassets/chat.imageset/Contents.json

@@ -1,23 +0,0 @@
-{
-  "images" : [
-    {
-      "idiom" : "universal",
-      "filename" : "chat.png",
-      "scale" : "1x"
-    },
-    {
-      "idiom" : "universal",
-      "filename" : "chat@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "idiom" : "universal",
-      "filename" : "chat@3x.png",
-      "scale" : "3x"
-    }
-  ],
-  "info" : {
-    "version" : 1,
-    "author" : "xcode"
-  }
-}

deltachat-ios/Assets.xcassets/ic_chat.imageset/Contents.json

@@ -2,17 +2,17 @@
   "images" : [
     {
       "idiom" : "universal",
-      "filename" : "outline_chat_black_24pt_1x.png",
+      "filename" : "icn_dc_1x.png",
       "scale" : "1x"
     },
     {
       "idiom" : "universal",
-      "filename" : "outline_chat_black_24pt_2x.png",
+      "filename" : "icn_dc_2x.png",
       "scale" : "2x"
     },
     {
       "idiom" : "universal",
-      "filename" : "outline_chat_black_24pt_3x.png",
+      "filename" : "icn_dc_3x.png",
       "scale" : "3x"
     }
   ],