Wrap variable initializations after '=' consistently

Replace a few occurrences of

        type var
            = value;

with

        type var =
            value;

which is used much more widely in wx sources for consistency.

Also get rid of a couple of such lines, when it could be done easily.

No real changes.

src/common/ctrlsub.cpp

@@ -168,8 +168,8 @@ void wxItemContainer::SetClientObject(unsigned int n, wxClientData *data)
 
     if ( HasClientObjectData() )
     {
-        wxClientData * clientDataOld
-            = static_cast<wxClientData *>(DoGetItemClientData(n));
+        wxClientData * clientDataOld =
+            static_cast<wxClientData *>(DoGetItemClientData(n));
         if ( clientDataOld )
             delete clientDataOld;
     }