Increase "Grab Area" for Resizing NINA Window

[Bill Richards]

The grab area for resizing NINA’s window is very small and I often have difficulty finding the exact place to grab a corner to resize the window. This would be much easier if the grab area were increased a bit.

[Stefan B]

This would be only possible by increasing the border size of N.I.N.A. and interfer with the UI design. The grab area is using the standard size as other windows apps