Object not synced if you remove and add the same file in the bucket

[ron-damon]

In the following scenario, object FOO doesn't sync properly:

1. 🟢 FOO object is uploaded to the bucket -> objinsync add them
2. 🟢 FOO object is deleted from the bucket -> objinsync remove them
3. 🔴 The same FOO object is uploaded again to the bucket -> objinsync doesn't add them
   If I restart objinsync after this step, it will sync properly.
4. 🟢 FOO object is uploaded with a modified content -> objinsync add them

I think it's because of the uidCache that is not purged when a file is deleted.
Maybe adding a delete in this for works:

		for f, _ := range self.filesToDelete {
			os.Remove(f)
			uidKey, err := uidKeyFromLocalPath(self.LocalDir, f)
			if err == nil {
				self.uidLock.Lock()
				delete(self.uidCache, uidKey)
				self.uidLock.Unlock()
			}
		}

Disclaimer: I'm not a Go expert

[houqp]

I think you are a go expert, that is the right fix. good catch! could you send a PR?

[houqp]

This bug fix should be included in release v2.4.1