This commits corrects the calculation of the Frame Node label size, making it independent of the 'Line Width' user preference. Since `U.dpi` is actually DPI divided by `U.pixelsize` and `U.pixelsize` is calculated from line-width multiplying by `U.pixelsize` undoes the connection between line-width and label size. It now stays the same, regardless of the line-width setting. Reviewed By: Julian Eisel, Harley Acheson Differential Revision: https://developer.blender.org/D14338