Update slider thumb image

Riot/Assets/Images.xcassets/VoiceBroadcast/voice_broadcast_slider_thumb.imageset/Contents.json

@@ -1,8 +1,19 @@
 {
   "images" : [
     {
-      "filename" : "voice_broadcast_slider_thumb.svg",
-      "idiom" : "universal"
+      "filename" : "voice_broadcast_slider_thumb.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "voice_broadcast_slider_thumb@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "voice_broadcast_slider_thumb@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
     }
   ],
   "info" : {

Riot/Assets/Images.xcassets/VoiceBroadcast/voice_broadcast_slider_thumb.imageset/voice_broadcast_slider_thumb.svg

@@ -1,3 +0,0 @@
-<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
-<circle cx="8" cy="8" r="8" fill="#737D8C"/>
-</svg>