Fix commit page js error (1.11 backport) (#11527)

Partial backport of fd094ee to 1.11.

Fixes: #11518

Author: silverwind

routers/repo/commit.go

@@ -201,6 +201,8 @@ func FileHistory(ctx *context.Context) {
 func Diff(ctx *context.Context) {
 	ctx.Data["PageIsDiff"] = true
 	ctx.Data["RequireHighlightJS"] = true
+	ctx.Data["RequireSimpleMDE"] = true
+	ctx.Data["RequireTribute"] = true
 
 	userName := ctx.Repo.Owner.Name
 	repoName := ctx.Repo.Repository.Name