Solid Bed mount - Cable chain compatible

Remix from https://www.thingiverse.com/thing:3742788 and https://www.thingiverse.com/thing:2920060 to be able to use the cable chain with silicon solid bed mount.

It only remixes the "cableChain_bedCorner_v2.stl" file. all other parts are unchanged

ok on Ender 3 Pro with glass bed