Replaced iPhone image set with an universal one.

Author: Metaxa007

OpenDocumentReader/Assets.xcassets/launch_image.imageset/Contents.json

@@ -2,29 +2,17 @@
   "images" : [
     {
       "idiom" : "universal",
+      "filename" : "launch_image.png",
       "scale" : "1x"
     },
     {
       "idiom" : "universal",
+      "filename" : "launch_image@2x.png",
       "scale" : "2x"
     },
     {
       "idiom" : "universal",
-      "scale" : "3x"
-    },
-    {
-      "idiom" : "iphone",
-      "filename" : "launch_image.png",
-      "scale" : "1x"
-    },
-    {
-      "idiom" : "iphone",
-      "filename" : "launch_image-1.png",
-      "scale" : "2x"
-    },
-    {
-      "idiom" : "iphone",
-      "filename" : "launch_image-2.png",
+      "filename" : "launch_image@3x.png",
       "scale" : "3x"
     }
   ],