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/image.cpp

@@ -1317,8 +1317,8 @@ wxImage wxImage::Rotate90( bool clockwise ) const
 
         for (long j = 0; j < height; j++)
         {
-            const unsigned char *source_data
-                                     = M_IMGDATA->m_data + (j*width + ii)*3;
+            const unsigned char *source_data =
+                M_IMGDATA->m_data + (j*width + ii)*3;
 
             for (long i = ii; i < next_ii; i++)
             {