Make Residual trivially destructable

Tracking/TrkAlignment/TrkAlignEvent/TrkAlignEvent/Residual.h

@@ -25,7 +25,7 @@ namespace Trk {
 
   public:
     Residual(AlignResidualType resType, AlignMesType mesType, ParamDefs param, double residual, double errSq);
-    ~Residual();
+    ~Residual() = default;
 
     /** returns residual type */
     AlignResidualType residualType() const;

Tracking/TrkAlignment/TrkAlignEvent/src/Residual.cxx

@@ -16,10 +16,4 @@ namespace Trk {
   {
     
   }
-  
-  Residual::~Residual()
-  {
-    
-  }
-  
 }