cubicweb #2829481 no need for particular treatment for Boolean in rql2sql [validation pending]

boolean values should be but in substition values as others, instead of being inserted in the RQL string as done currently.

done in3.17.0
load left0.000
closed by#eebf286b405e [rql2sql] Boolean values should be substitued like others. Closes #2829481
patch[rql2sql] Boolean values don't need particular treatments and should be substitued as others [applied]