CppTools: modernize

Change-Id: Iaf02e4d026f1ac8b216833d83cd7a735e21ff60a
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/cpptools/cppmodelmanagersupport.cpp

@@ -27,6 +27,4 @@
 
 using namespace CppTools;
 
-ModelManagerSupport::~ModelManagerSupport()
-{
-}
+ModelManagerSupport::~ModelManagerSupport() = default;