Drop default values for parameters that are defaulted only once

Seriously, such default values only serve to confuse the code reader.

Change-Id: I478442514baac3159ea0ae20132222ae58b38b8c

vcl/osx/clipboard.hxx

@@ -78,8 +78,8 @@ public:
      system clipboard will be created (bUseSystemClipboard == true) or if
      the DragPasteboard if bUseSystemClipboard == false
    */
-  AquaClipboard(NSPasteboard* pasteboard = nullptr,
-                bool bUseSystemClipboard = true);
+  AquaClipboard(NSPasteboard* pasteboard,
+                bool bUseSystemClipboard);
 
   virtual ~AquaClipboard() override;
   AquaClipboard(const AquaClipboard&) = delete;

vcl/osx/service_entry.cxx

@@ -41,7 +41,7 @@ uno::Reference< XInterface > AquaSalInstance::CreateClipboard( const Sequence< A
 
     SalData* pSalData = GetSalData();
     if( ! pSalData->mxClipboard.is() )
-        pSalData->mxClipboard.set(static_cast< XClipboard* >(new AquaClipboard()), UNO_QUERY);
+        pSalData->mxClipboard.set(static_cast< XClipboard* >(new AquaClipboard(nullptr, true)), UNO_QUERY);
     return pSalData->mxClipboard;
 }