Fix wrong usage of the query function

[Azouz-Jribi]

Questions	Answers
Branch?	1.6.1.x
Description?	Wrong usage of the query function Db::getInstance()->query()
Type?	bug fix
Category?	CO
BC breaks?	no
Deprecations?	no
Fixed ticket?
How to test?

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This change is 

[Quetzacoalt91]

@Azouz-Jribi, what is the issue you try to solve here?
By looking at the code in Db::executeS(), it appears that setting the 2nd parameter as false make this called function only an alias for ... Db::query().

[Azouz-Jribi]

Hi @Quetzacoalt91
I just duplicate this PR (#8417) on the 1.6, and already there is a PR (https://github.com/PrestaShop/blocklayered/pull/ 99) that solves the problem described in Jocel's PR.