fix tracking file after rename: sync rename mode constant on eBPF and…

… agent side

The problem was from eBPF we receive rename event as '0' constant (see pkg/ebpf/vfs.c:137), but
on agent side we assume it is constant of value '2'. Change agent side constant to '0' to be aligned
with eBPF raw event.

pkg/watcher.go

@@ -43,7 +43,7 @@ var (
 )
 
 const (
-	renameEvent = 2
+	renameEvent = 0
 	dirCreate   = 3
 	fileCreate  = 4
 	delFile     = -1