[apps/calculation] When leaving calculation app, do not invalid

calculation height memoization. They're computed from the layouts which
don't depend on the complex format (or any other settings parameters
which could have changed).

apps/calculation/calculation_store.cpp

@@ -163,9 +163,6 @@ void CalculationStore::tidy() {
     return;
   }
   resetMemoizedModelsAfterCalculationIndex(-1);
-  for (Calculation * c : *this) {
-    c->tidy();
-  }
 }
 
 Expression CalculationStore::ansExpression(Context * context) {