Fix unsafeEqThunk equality check (#34)

* unsafeEqThunk should call eqFn (a1/a2), not refEq

* eqFn is actually (b1/b2)

Author: thomashoneyman

src/Halogen/VDom/Thunk.purs

@@ -84,7 +84,7 @@ unsafeEqThunk ∷ ∀ f i. Fn.Fn2 (Thunk f i) (Thunk f i) Boolean
 unsafeEqThunk = Fn.mkFn2 \(Thunk a1 b1 _ d1) (Thunk a2 b2 _ d2) →
   Fn.runFn2 Util.refEq a1 a2 &&
   Fn.runFn2 Util.refEq b1 b2 &&
-  Fn.runFn2 Util.refEq d1 d2
+  Fn.runFn2 b1 d1 d2
 
 type ThunkState f i a w =
   { thunk ∷ Thunk f i