Ensure RSS icon is present on all repo tabs (#23904)

Previously, not all repo tabs had shown the RSS icon in the repo header
because the context data was not being set. Added this context data in a
new function.

Before:

<img width="806" alt="image"
src="https://user-images.githubusercontent.com/115237/229639615-9cc00e75-3a26-4ff4-a6f2-316c1fccc596.png">

After:

<img width="815" alt="Screenshot 2023-04-04 at 00 16 17"
src="https://user-images.githubusercontent.com/115237/229639201-2e1c015b-1f13-46d4-aa14-e7a82fab3982.png">

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/repo/view.go

@@ -711,9 +711,6 @@ func Home(ctx *context.Context) {
 			feed.ShowRepoFeed(ctx, ctx.Repo.Repository, showFeedType)
 			return
 		}
-
-		ctx.Data["EnableFeed"] = true
-		ctx.Data["FeedURL"] = ctx.Repo.Repository.Link()
 	}
 
 	checkHomeCodeViewable(ctx)