Adjustment to job classes for loose checking in constructor

[awebartisan]

While using ShopModelTrait, base Shop model or its child class is not passed in constructor of two jobs, WebhookInstaller and ScriptTagInstaller, so we can remove the type hinting from constructor to solve this issue.

[coveralls]

Coverage remained the same at 100.0% when pulling 768fa3f on awebartisan:master into ce24ab5 on ohmybrew:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 768fa3f on awebartisan:master into ce24ab5 on ohmybrew:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 768fa3f on awebartisan:master into ce24ab5 on ohmybrew:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 768fa3f on awebartisan:master into ce24ab5 on ohmybrew:master.

[gnikyt]

thanks!