[linuxinput] do not discover on ENTRY_MODIFY

ENTRY_MODIFY is triggered on each keypress multiple times, so we should
not trigger on it.

The usecase for ENTRY_MODIFY triggers where detecting permission changes
of the event nodes.
Inotify does have a dedicate event ("ATTRIB") for that but Java
WatchService normalizes this to a ENTRY_MODIFY event
(See LinuxWatchService.java)

After permission changes users now have to trigger a scan manually.

bundles/org.openhab.binding.linuxinput/src/main/java/org/openhab/binding/linuxinput/internal/LinuxInputDiscoveryService.java

@@ -168,8 +168,10 @@ protected void startBackgroundDiscovery() {
 
     private WatchService makeWatcher() throws IOException {
         WatchService watchService = FileSystems.getDefault().newWatchService();
+        // FIXME also trigger on inotify "ATTRIB" events when WatchService supports this.
+        // Triggering on ENTRY_MODIFY will trigger multiple times on each keypress for *any* input device.
         DEVICE_DIRECTORY.register(watchService, StandardWatchEventKinds.ENTRY_CREATE,
-                StandardWatchEventKinds.ENTRY_DELETE, StandardWatchEventKinds.ENTRY_MODIFY);
+                StandardWatchEventKinds.ENTRY_DELETE);
         return watchService;
     }