Xreader always opens fullscreen

```
 * Xreader version (xreader --version): 2.0.1
 * Distribution: LM19.1 MATE
```

**Issue**
Xreader always opens fullscreen. It briefly flashes the window size it was closed with and then goes fullscreen.


**Steps to reproduce**
Click on a .pdf


**Expected behaviour**
To remember the window size/state.

**Other information**
