Add buttons for hiding watched videos

Fix #448

Shared/Channels/ChannelPlaylistView.swift

@@ -102,6 +102,7 @@ struct ChannelPlaylistView: View {
             ToolbarItem(placement: playlistButtonsPlacement) {
                 HStack {
                     ListingStyleButtons(listingStyle: $channelPlaylistListingStyle)
+                    HideWatchedButtons()
                     HideShortsButtons(hide: $hideShorts)
                     ShareButton(contentItem: contentItem)
 
@@ -131,6 +132,7 @@ struct ChannelPlaylistView: View {
                 ListingStyleButtons(listingStyle: $channelPlaylistListingStyle)
 
                 Section {
+                    HideWatchedButtons()
                     HideShortsButtons(hide: $hideShorts)
                 }
 

Shared/Channels/ChannelVideosView.swift

@@ -137,6 +137,7 @@ struct ChannelVideosView: View {
                     }
 
                     ListingStyleButtons(listingStyle: $channelPlaylistListingStyle)
+                    HideWatchedButtons()
                     HideShortsButtons(hide: $hideShorts)
                     contentTypePicker
                 }
@@ -281,6 +282,7 @@ struct ChannelVideosView: View {
                     ListingStyleButtons(listingStyle: $channelPlaylistListingStyle)
 
                     Section {
+                        HideWatchedButtons()
                         HideShortsButtons(hide: $hideShorts)
                     }
                 }