test(pcapfilter): fix dropwatch.o path in TestApply

The BPF object lives under bpf/, not core/events/.
Update the relative path from ../../core/events/dropwatch.o to
../../bpf/dropwatch.o.

Signed-off-by: zhangtonghao <zhangtonghao@didiglobal.com>
Signed-off-by: Tonghao Zhang <tonghao@bamaicloud.com>

Author: hao022

internal/pcapfilter/load_default_test.go

@@ -67,7 +67,7 @@ func TestApply(t *testing.T) {
 		t.Skip("Skipping: requires root")
 	}
 
-	origELF, err := os.ReadFile("../../core/events/dropwatch.o")
+	origELF, err := os.ReadFile("../../bpf/dropwatch.o")
 	if err != nil {
 		t.Fatalf("Read error: %v", err)
 	}