Secure dimension settings in current drawing preferences

[lordofbikes]

This issue was triggered by forum thread https://forum.librecad.org/point-select-not-working-tp5720321p5720351.html
and is related to #1328

Observed behavior

When both, arrow size AND tick size, are set to 0 in Current Drawing Preferences, dimensions become sticky for single click selection.
It's impossible to select any regular entity, always one of the dimensions is selected with a single left click.

Even when this is not the intention of dimensions, this case, arrow size = tick size = 0, should be secured to prevent this unexpected behavior.

Angular and radial dimensions are already secured and are save for both sizes set to 0.

Steps to reproduce or sample file

• create a drawing with some entities
• add some dimensions
• set arrow size and tick size to zero
• try to select one of the non dimension entities

Operating System and LibreCAD version info

all OS
latest master code