Take 'incognito' into account when reposting

## Issue
Fixes 5661: can't choose anonymous from channel on repost page

ui/component/repostCreate/index.js

@@ -17,7 +17,7 @@ import {
   selectFetchingMyChannels,
 } from 'lbry-redux';
 import { doToast } from 'redux/actions/notifications';
-import { selectActiveChannelClaim } from 'redux/selectors/app';
+import { selectActiveChannelClaim, selectIncognito } from 'redux/selectors/app';
 import RepostCreate from './view';
 
 const select = (state, props) => ({
@@ -37,6 +37,7 @@ const select = (state, props) => ({
   isResolvingEnteredRepost: props.repostUri && makeSelectIsUriResolving(`lbry://${props.repostUri}`)(state),
   activeChannelClaim: selectActiveChannelClaim(state),
   fetchingMyChannels: selectFetchingMyChannels(state),
+  incognito: selectIncognito(state),
 });
 
 export default connect(select, {

ui/component/repostCreate/view.jsx

@@ -42,6 +42,7 @@ type Props = {
   isResolvingEnteredRepost: boolean,
   activeChannelClaim: ?ChannelClaim,
   fetchingMyChannels: boolean,
+  incognito: boolean,
 };
 
 function RepostCreate(props: Props) {
@@ -67,6 +68,7 @@ function RepostCreate(props: Props) {
     isResolvingEnteredRepost,
     activeChannelClaim,
     fetchingMyChannels,
+    incognito,
   } = props;
 
   const defaultName = name || (claim && claim.name) || '';
@@ -281,7 +283,7 @@ function RepostCreate(props: Props) {
       doRepost({
         name: enteredRepostName,
         bid: creditsToString(repostBid),
-        channel_id: activeChannelClaim ? activeChannelClaim.claim_id : undefined,
+        channel_id: activeChannelClaim && !incognito ? activeChannelClaim.claim_id : undefined,
         claim_id: repostClaimId,
       }).then((repostClaim: StreamClaim) => {
         doCheckPendingClaims();