smb: fix server-side move of directories with special characters in the name - fixes #9677

DirMove checked whether the destination exists using the raw path but
performed the rename with the encoded path, so for directory names
needing encoding (trailing spaces or periods, characters like
\* ? : < > | " or a literal backslash) the existence check looked at
a different server path than the rename used.

backend/smb/smb.go

@@ -438,7 +438,7 @@ func (f *Fs) DirMove(ctx context.Context, src fs.Fs, srcRemote, dstRemote string
 	}
 	defer f.putConnection(&cn, err)
 
-	_, err = cn.smbShare.Stat(dstPath)
+	_, err = cn.smbShare.Stat(f.toSambaPath(dstPath))
 	if os.IsNotExist(err) {
 		err = cn.smbShare.Rename(f.toSambaPath(srcPath), f.toSambaPath(dstPath))
 		return translateError(err, true)