Xed is no longer remembering window position

```
 * Xed version (2.6.0)
 * Distribution - (Mint 19.2...)
```

**Issue**
Xed is no longer remembering window position


**Steps to reproduce**
open xed, move it somewhere, close it... open it again... window is always centered


**Expected behaviour**
open xed, move it somewhere, close it... open it again...window opens where it was last


**Other information**
