chore: use skip instead of -failIfUnchanged in the default tactic of Homeomorph (leanprover-community#39758)

This way, we do not try to call `fun_prop` again when `dsimp` could not make any simplification. This makes a difference only when the default tactic fails, so this change should not affect working code.

Author: gasparattila

Mathlib/Topology/Homeomorph/Defs.lean

@@ -44,10 +44,10 @@ structure Homeomorph (X : Type*) (Y : Type*) [TopologicalSpace X] [TopologicalSp
     extends X ≃ Y where
   /-- The forward map of a homeomorphism is a continuous function. -/
   continuous_toFun : Continuous toFun := by
-    first | fun_prop | eta_expand; dsimp -failIfUnchanged; fun_prop
+    first | fun_prop | eta_expand; dsimp; fun_prop | skip
   /-- The inverse map of a homeomorphism is a continuous function. -/
   continuous_invFun : Continuous invFun := by
-    first | fun_prop | eta_expand; dsimp -failIfUnchanged; fun_prop
+    first | fun_prop | eta_expand; dsimp; fun_prop | skip
 
 @[inherit_doc]
 infixl:25 " ≃ₜ " => Homeomorph