Device image cleanup

Meshtastic/Assets.xcassets/RAK11200.imageset/Contents.json

@@ -1,7 +1,7 @@
 {
   "images" : [
     {
-      "filename" : "RAK_DEV_KIT.jpg",
+      "filename" : "RAK_DEV_KIT-2 1.jpg",
       "idiom" : "universal",
       "scale" : "1x"
     },

Meshtastic/Assets.xcassets/RAK4631.imageset/Contents.json

@@ -1,17 +1,17 @@
 {
   "images" : [
     {
-      "filename" : "RAK_DEV_KIT.jpg",
+      "filename" : "RAK 6.png",
       "idiom" : "universal",
       "scale" : "1x"
     },
     {
-      "filename" : "RAK_DEV_KIT-1.jpg",
+      "filename" : "RAK 5.png",
       "idiom" : "universal",
       "scale" : "2x"
     },
     {
-      "filename" : "RAK_DEV_KIT-2.jpg",
+      "filename" : "RAK 4.png",
       "idiom" : "universal",
       "scale" : "3x"
     }