fix related tests

weed/storage/needle/compact_map_test.go

@@ -68,7 +68,7 @@ func TestCompactMap(t *testing.T) {
 				t.Fatal("key", i, "size", v.Size)
 			}
 		} else if i%37 == 0 {
-			if ok && v.Size > 0 {
+			if ok && v.Size != TombstoneFileSize {
 				t.Fatal("key", i, "should have been deleted needle value", v)
 			}
 		} else if i%2 == 0 {
@@ -81,7 +81,7 @@ func TestCompactMap(t *testing.T) {
 	for i := uint32(10 * batch); i < 100*batch; i++ {
 		v, ok := m.Get(NeedleId(i))
 		if i%37 == 0 {
-			if ok && v.Size > 0 {
+			if ok && v.Size != TombstoneFileSize {
 				t.Fatal("key", i, "should have been deleted needle value", v)
 			}
 		} else if i%2 == 0 {