Remove option Escape characters? in Sql component

[Hooghof]

The option Escape characters? in the Sql component is not used, so because of this we want to reduce the maintenance and decided to remove the option.

Related to https://github.com/fluxygen/front-end/issues/6899

[skin27]

This has been removed from the frontend and backend on next. (In 4.17.13 this will be set hidden).