Pegstr Enhanced Remix

Small tweak to jonnolen's [Pegstr - Pegboard Wizard - Fixed and Enhanced](https://www.thingiverse.com/thing:5370488/files), which is an improvement on mgx's excellent [Pegstr - Pegboard Wizard](https://www.thingiverse.com/thing:537516/comments).

The wall thickness of the cylinders (orifices) were overlapping too much and reducing the cylinder internal diameter.
I modified the holders module around line 210 to reduce the cylinder thickness from 2 to 1.5 x the wall thickness (example below).

```
// (holder_y_size + 2*wall_thickness), // removed
(holder_y_size + 1.5*wall_thickness), // added
```

Using the following variables to hold drill bits (in Canada)
```
holder_x_size = 7.05;
holder_y_size = 7.05;
holder_height = 15.0;
wall_thickness = 1.2;
corner_radius = 5;
holder_offset = 5.0;
strength_factor = 0.5;
closed_bottom = 1.0;
hole_size = 5.15;
```