backend/local: Don't count outputs for choosing diff action symbols

We're not yet showing outputs in the rendered diff, so it doesn't make
sense to count them for the purpose of deciding which change action
symbols to include in the legend.

backend/local/backend_plan.go

@@ -177,9 +177,6 @@ func (b *Local) renderPlan(plan *plans.Plan, schemas *terraform.Schemas) {
 	for _, change := range plan.Changes.Resources {
 		counts[change.Action]++
 	}
-	for _, change := range plan.Changes.RootOutputs {
-		counts[change.Action]++
-	}
 
 	headerBuf := &bytes.Buffer{}
 	fmt.Fprintf(headerBuf, "\n%s\n", strings.TrimSpace(planHeaderIntro))