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/imagtiff.cpp

@@ -804,8 +804,8 @@ bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo
                     if (hasAlpha)
                     {
                         value = image->GetAlpha(column, row);
-                        buf[column*bytesPerPixel+1]
-                            = minIsWhite ? 255 - value : value;
+                        buf[column*bytesPerPixel+1] = minIsWhite ? 255 - value
+                                                                 : value;
                     }
                 }
             }