[Bug]: wx + windows draws mouseover cursor text beyond the toolbar's extents

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### Bug summary

The mouseover cursor text is drawn "to the right" of the actual toolbar on wx + windows.

### Code for reproduction

```python
from pylab import *
mpl.use("wxagg")
imshow([[1, 2]])
show()
# then mouseover the image
```

### Actual outcome

You can guess the "x" and the "[" being cropped at the extreme right of the toolbar.

### Expected outcome

The text is flush right, as with other backends and with wxgtk.

### Additional information

This seems to have failed ever since the removal of the separate statusbar which moved the mouseover text to the toolbar's right.

### Operating system

windows

### Matplotlib Version

3.5.1, but tested for all relevant versions

### Matplotlib Backend

wxagg

### Python version

3.9

### Jupyter version

none

### Installation

git checkout

Start with the wxagg backend and run the provided reproduction on Windows, then compare the toolbar text placement with wxgtk or another backend. Trace the code handling the toolbar's mouseover text after the separate statusbar was removed. Done means the text is flush right and no longer extends beyond the toolbar.

Written by the indexing model from the issue text.