Cleanup: silence warning in recent commit

Thanks to Dr. Sybren for pointing it out!

source/blender/editors/space_nla/nla_draw.c

@@ -550,7 +550,7 @@ static void nla_draw_strip(SpaceNla *snla,
   /* draw strip outline
    * - color used here is to indicate active vs non-active
    */
-  if (strip->flag & NLASTRIP_FLAG_ACTIVE | strip->flag & NLASTRIP_FLAG_SELECT) {
+  if (strip->flag & (NLASTRIP_FLAG_ACTIVE | NLASTRIP_FLAG_SELECT)) {
     /* strip should appear 'sunken', so draw a light border around it */
     color[0] = color[1] = color[2] = 1.0f; /* FIXME: hardcoded temp-hack colors */
   }