fix alpha channel by redoing the recIcons and adding the purple bg to the square ones

StickerSlackiMessageExtension/Assets.xcassets/iMessage App Icon.stickersiconset/Contents.json

@@ -1,13 +1,13 @@
 {
   "images" : [
     {
-      "filename" : "messagesIcon58.png",
+      "filename" : "Icon58.png",
       "idiom" : "iphone",
       "scale" : "2x",
       "size" : "29x29"
     },
     {
-      "filename" : "messagesIcon87.png",
+      "filename" : "Icon87.png",
       "idiom" : "iphone",
       "scale" : "3x",
       "size" : "29x29"
@@ -25,7 +25,7 @@
       "size" : "60x45"
     },
     {
-      "filename" : "messagesIcon58.png",
+      "filename" : "Icon58 1.png",
       "idiom" : "ipad",
       "scale" : "2x",
       "size" : "29x29"
@@ -43,7 +43,7 @@
       "size" : "74x55"
     },
     {
-      "filename" : "messagesIcon.png",
+      "filename" : "Icon.png",
       "idiom" : "ios-marketing",
       "scale" : "1x",
       "size" : "1024x1024"