Applications: Use default constructors/destructors

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules

"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."

Userland/Applications/Spreadsheet/JSIntegration.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, the SerenityOS developers.
+ * Copyright (c) 2020-2022, the SerenityOS developers.
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -97,10 +97,6 @@ SheetGlobalObject::SheetGlobalObject(Sheet& sheet)
 {
 }
 
-SheetGlobalObject::~SheetGlobalObject()
-{
-}
-
 JS::ThrowCompletionOr<bool> SheetGlobalObject::internal_has_property(JS::PropertyKey const& name) const
 {
     if (name.is_string()) {
@@ -362,10 +358,6 @@ WorkbookObject::WorkbookObject(Workbook& workbook, JS::GlobalObject& global_obje
 {
 }
 
-WorkbookObject::~WorkbookObject()
-{
-}
-
 void WorkbookObject::initialize(JS::GlobalObject& global_object)
 {
     Object::initialize(global_object);