- remove anon option in channel dropdown when livestream tab is selected
- attempt to fill publish form with current active channel name just prior to publishing to (edge condition)
- edge condition occurs when user fills out form fully. User switches to Post (which allows anon in drop down selector). User selects Anon channel, then switches back to the livestream tab. The form was previously updated with `channel: undefined` but does not get changed when clicking the livestream tab. So we just updated the form one last time prior to publishing as a livestream
- Show most recent livestream claim on livestream setup page instead of first livestream claim
This option allows users to bypass the "publish preview" modal. Users can disable it by checking "don't show this again" in the modal, and re-enable it in the Settings Page.
This requires an accompanying change in lbry-redux. Search for "SETTINGS.ENABLE_PUBLISH_PREVIEW" in the commit message to find the commit.
In Edit Mode, the preview will not appear. Not sure if it's needed, plus there are more things to handle in Edit mode (e.g. which items are changed)
## Issue
Users are annoyed with the constant reset of the 'channel' setting in the Publish page.
## Changes
1. Revert the previous attempt in ff7b4092. The `usePersistedState` method is bad, as it will clash with the Redux value.
2. Implemented the persistence in Redux -- requires "https://github.com/lbryio/lbry-redux/pull/347".
---Fixes:
#-2882: "Fix UX around publishing to already published URL".
---Changes:
1. Improved the error message (change color to red; emphasized the URL; tweaked the sentences a bit).
2. The `Publish` button will be grayed out in this scenario, until user explicitly decides to edit existing claim instead.
