removed unused video icon and added video icon used in video invite cell

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

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "filename" : "round_videocam_black_24pt_1x.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "round_videocam_black_24pt_2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "round_videocam_black_24pt_3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

deltachat-ios/Assets.xcassets/ic_voice_chat_black_36dp/ios/ic_voice_chat_36pt.imageset/Contents.json

@@ -1,23 +0,0 @@
-{
-    "images": [
-        {
-            "filename": "ic_voice_chat_36pt.png",
-            "idiom": "universal",
-            "scale": "1x"
-        },
-        {
-            "filename": "ic_voice_chat_36pt_2x.png",
-            "idiom": "universal",
-            "scale": "2x"
-        },
-        {
-            "filename": "ic_voice_chat_36pt_3x.png",
-            "idiom": "universal",
-            "scale": "3x"
-        }
-    ],
-    "info": {
-        "author": "xcode",
-        "version": 1
-    }
-}

deltachat-ios/Assets.xcassets/ic_voice_chat_white_36dp/Contents.json

@@ -1,6 +0,0 @@
-{
-  "info" : {
-    "version" : 1,
-    "author" : "xcode"
-  }
-}

deltachat-ios/Assets.xcassets/ic_voice_chat_white_36dp/ios/ic_voice_chat_white_36pt.imageset/Contents.json

@@ -1,23 +0,0 @@
-{
-    "images": [
-        {
-            "filename": "ic_voice_chat_white_36pt.png",
-            "idiom": "universal",
-            "scale": "1x"
-        },
-        {
-            "filename": "ic_voice_chat_white_36pt_2x.png",
-            "idiom": "universal",
-            "scale": "2x"
-        },
-        {
-            "filename": "ic_voice_chat_white_36pt_3x.png",
-            "idiom": "universal",
-            "scale": "3x"
-        }
-    ],
-    "info": {
-        "author": "xcode",
-        "version": 1
-    }
-}