win-capture: Draw cursor of actual size

[SuslikV]

When drawing cursor to window capture area - use actual resource width
and height instead of system metric values for icons.

Related issue: https://obsproject.com/forum/threads/cursor-capture.84507/

[SuslikV]

Animated cursors is out of scope in this PR. I think, it should be added as an option ("Allow animated cursors" or so).

[jp9000]

Make sure to include what the problem is or what it's fixing in the commit message in the future. For your commit message here, it just says "Draw cursor of actual size" and "use actual resource width
and height instead of system metric values for icons" with zero context as to what this is changing and why.

[SuslikV]

@jp9000 , please, add more comments to the code in the future. Sometimes, it is hard to understand why you divide by 2 or what the code should do.