CppEditor: Add enclosing template on "Move Definition Outside"

The template id for the class name is missing, but it's better than
nothing.

For example:

template<class T>
class Foo
{
    void func() {} // Move Definition Outside Class
};

// The following lines are added
template<class T>
void Foo::func() {} // Should be Foo<T>::func

Task-number: QTCREATORBUG-16649
Change-Id: Icb560e0b87f563cbda18f4742f44bb8ef4d8a900
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cppeditor/cppquickfixes.cpp

@@ -4657,6 +4657,7 @@ QString definitionSignature(const CppQuickFixInterface *assist,
     oo.showFunctionSignatures = true;
     oo.showReturnTypes = true;
     oo.showArgumentNames = true;
+    oo.showEnclosingTemplate = true;
     const Name *name = func->name();
     if (name && nameIncludesOperatorName(name)) {
         CoreDeclaratorAST *coreDeclarator = functionDefinitionAST->declarator->core_declarator;