Fix misleading indentation in Motif code

This commit contains whitespace-only changes (including adding one extra
new line) and no real ones.

Closes https://github.com/wxWidgets/wxWidgets/pull/1715

src/motif/window.cpp

@@ -1230,7 +1230,8 @@ void wxWindow::DoGetClientSize(int *x, int *y) const
     Widget widget = (Widget) GetClientWidget();
     Dimension xx, yy;
     XtVaGetValues(widget, XmNwidth, &xx, XmNheight, &yy, NULL);
-    if(x) *x = xx; if(y) *y = yy;
+    if(x) *x = xx;
+    if(y) *y = yy;
 }
 
 void wxWindow::DoSetSize(int x, int y, int width, int height, int sizeFlags)