Larger paper towel holder for shelf

Added 1mm to the top mount gap to reduce stress on my kitchen shelf. Added ribs to front and bottom parts for stiffness. Increased length of a holder and added distance from top parts to allow large towel rolls.
Larger is large enough to print on regular bambulab, but split_yourself model has to be cut in 2 parts in slicer and glued together. Done that because regular larger version was 1cm too short for my local rolls.