Mesh leveling settings are incorrect

[matthew-humphrey]

Several configuration settings for bed leveling are incorrect:

For Bilinear bed leveling, to match Prusa leveling area, these parameters should be set in Configuration.h:

// Set the boundaries for probing (where the probe can reach).
#define LEFT_PROBE_BED_POSITION 35
#define RIGHT_PROBE_BED_POSITION 238
#define FRONT_PROBE_BED_POSITION 6
#define BACK_PROBE_BED_POSITION 202

and the following setting should be set to zero

#define MIN_PROBE_EDGE 0

I think we should stick with bilinear bed leveling, but for those that want to experiment with Unified Bed Leveling, we can configure the mesh boundaries correctly by making this change to Configuration.h:

#define MESH_INSET 0             // Set Mesh bounds as an inset region of the bed
#define GRID_MAX_POINTS_X 5      // Don't use more than 15 points per axis, implementation limited.