fix: remove double entry key use

We called the use method of entry key twice: once from the
entrykeymanager and also when a read was successfull from the
entrymanager.
That caused an issue, that if the maxRead was not 1, then group members
might got no access to the key, because the remaining read counter was
zeroed before

internal/services/entrykeymanager.go

@@ -201,10 +201,6 @@ func (e *EntryKeyManager) GetDEKTx(ctx context.Context, tx *sql.Tx, entryUUID st
 		return nil, nil, errors.New("model is nil")
 	}
 
-	if err := e.model.Use(ctx, tx, entryKeyModel.UUID); err != nil {
-		return nil, nil, err
-	}
-
 	return dek, modelEntryKeyToEntryKey(entryKeyModel), nil
 
 }

internal/services/entrykeymanager_test.go

@@ -258,7 +258,6 @@ func TestEntryKeyManager_GetDEK(t *testing.T) {
 			Created:      time.Now(),
 		},
 	}, nil)
-	model.On("Use", ctx, mock.Anything, "test-uuid").Return(nil)
 
 	crypto := func(key []byte) Encrypter {
 		return encrypter