Improve "alwayDisplayButton" API to "alwaysDisplayLikes"

See https://github.com/xwiki/xwiki-platform/blob/4eecc150520e417f793b8da2006b7f83660d6201/xwiki-platform-core/xwiki-platform-like/xwiki-platform-like-api/src/main/java/org/xwiki/like/LikeConfiguration.java#L39

Rationale (https://matrix.to/#/!ikPtGZaGWtyblizzlR:matrix.xwiki.com/$161366202710732HDHPc:matrix.xwiki.com?via=matrix.org&via=matrix.xwiki.com&via=t2bot.io):

what if the UI changes and it's no longer a button in the future? it seems the intent of the config is to display the like information and not about whether there's a button or not

Proposal: alwaysDisplayLikes