Right clicking Equalizer permanently changes mouse icon to grab

### System Information

Arch Linux

### LMMS Version(s)

1.3.0-alpha.1.833+e50f312

### Most Recent Working Version

Most likely any version before the merge of #7595

### Bug Summary

Right clicking Equalizer (more specifically, the graph portion of the plugin) permanently changes the mouse icon to be a grab when hovering over the main window, which is unexpected. The issue is fixed when right clicking the main window. This issue might involve windows other than just the graph portion of the Equalizer plugin.

### Expected Behaviour

Right clicking the graph of the Equalizer keeps the mouse icon the same.

### Steps To Reproduce

1. Add Equalizer
2. Right click its graph
3. Right click main window to undo the change in icons.

### Logs

Click to expand

### Screenshots / Minimum Reproducible Project

_No response_

### Please search the issue tracker for existing bug reports before submitting your own.

- [x] I have searched all existing issues and confirmed that this is not a duplicate.