Fix #549 - Use correct http method

Signed-off-by: Andrew DeMaria <lostonamountain@gmail.com>

airsonic-main/src/main/java/org/airsonic/player/controller/SetMusicFileInfoController.java

@@ -44,7 +44,7 @@ public class SetMusicFileInfoController {
     @Autowired
     private MediaFileService mediaFileService;
 
-    @RequestMapping(method = RequestMethod.GET)
+    @RequestMapping(method = RequestMethod.POST)
     protected ModelAndView handleRequestInternal(HttpServletRequest request) throws Exception {
         int id = ServletRequestUtils.getRequiredIntParameter(request, "id");
         String action = request.getParameter("action");