High DPI Monitors and Editor Ruler

When using a high DPI monitor the Editor ruler will display an incorrect value in relation to the grid scale.

This was tested on a monitor with a resolution of 3840x2160

1. Open a project and change the viewing mode from perspective to top
2. In the grid use the middle mouse click and drag to use the ruler
3. Drag across any distance and notice that the number displayed by the ruler

Result: The number that the ruler displays does not match that of the grid.

Expected: If the grid value is set to a specific number that number should be used for the ruler.

Notes: In the Editor preferences, disabling High DPI Support causes the ruler to act as normal.