Fix dpi changed handling in the windows

[dsafa]

Describe the bug
If the settings window is dragged from one monitor to a monitor with a different dpi, the mouse is in the wrong relative position. Also it may get caught in a resize loop.

To Reproduce
Steps to reproduce the behavior:

1. Have two monitors with different DPI
2. Move the settings window from one to another

Expected behavior
The window will be adjusted properly for the new dpi. The mouse stays in the same relative position.

Actual behavior
The mouse is in a different relative position. Sometimes the window will also glitch out.

Details
Since the WM_DPICHANGED changed message is manually handled, it should actually be handled properly. Currently the lparam is ignored when it shouldn't be. Using the suggested rect provided should be enough to fix the issue.

Version Info

• Windows 10 1903
• AudioBand Version 0.9.2