ref tests: normalize subgoal to goal

test-normalizer.sed

+# adjust for https://github.com/coq/coq/pull/13656
+s/subgoal/goal/g

tests/telescopes.ref

-1 subgoal
+1 goal
   
   X : tele
   α, β, γ1, γ2 : X → Prop
   ============================
   accessor α β γ1 → accessor α β (λ.. x : X, γ1 x ∨ γ2 x)
-1 subgoal
+1 goal
   
   X : tele
   α, β, γ1, γ2 : X → Prop
   ============================
   ∀.. x : X, γ1 x → (λ.. x0 : X, γ1 x0 ∨ γ2 x0) x
-1 subgoal
+1 goal
   
   X : tele
   α, β, γ1, γ2 : X → Prop