Fix diff view style handling (#36324)

Fix #36323

services/contexttest/context_tests.go

@@ -162,8 +162,10 @@ func LoadUser(t *testing.T, ctx gocontext.Context, userID int64) {
 	switch ctx := ctx.(type) {
 	case *context.Context:
 		ctx.Doer = doer
+		ctx.IsSigned = true
 	case *context.APIContext:
 		ctx.Doer = doer
+		ctx.IsSigned = true
 	default:
 		assert.FailNow(t, "context is not *context.Context or *context.APIContext")
 	}