Fix audio and video call buttons in conversation

GitLab: #105
Change-Id: Ic1fcd4143abbc77588c8eb41936aac7b27c67c35
diff --git a/client/src/components/Button.tsx b/client/src/components/Button.tsx
index 4937c0b..8e695cb 100644
--- a/client/src/components/Button.tsx
+++ b/client/src/components/Button.tsx
@@ -351,11 +351,11 @@
 };
 
 export const StartVideoCallButton = (props: IconButtonProps) => {
-  return <SquareButton {...props} aria-label="start audio call" Icon={AudioCallIcon} />;
+  return <SquareButton {...props} aria-label="start audio call" Icon={VideoCallIcon} />;
 };
 
 export const StartAudioCallButton = (props: IconButtonProps) => {
-  return <SquareButton {...props} aria-label="start video call" Icon={VideoCallIcon} />;
+  return <SquareButton {...props} aria-label="start video call" Icon={AudioCallIcon} />;
 };
 
 export const UploadFileButton = (props: IconButtonProps) => {