update location icons

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

@@ -2,17 +2,17 @@
   "images" : [
     {
       "idiom" : "universal",
-      "filename" : "ic_location_on_white_24dp-2.png",
+      "filename" : "ic_location_on_white_24pt_1x.png",
       "scale" : "1x"
     },
     {
       "idiom" : "universal",
-      "filename" : "ic_location_on_white_24dp-1.png",
+      "filename" : "ic_location_on_white_24pt_2x.png",
       "scale" : "2x"
     },
     {
       "idiom" : "universal",
-      "filename" : "ic_location_on_white_24dp.png",
+      "filename" : "ic_location_on_white_24pt_3x.png",
       "scale" : "3x"
     }
   ],