[make-entity]Keep the 'is' prefixes for booleans properties setters

[octoseth]

When generating a new entity, if we name a boolean property with the prefix "is", this prefix is removed to construct the setter.

example:

bool $isInternational;

public function isInternational(): ?bool
{
   return $this->isInternational;
}

public function setInternational(bool $isInternational): static
{
   $this->isInternational = $isInternational;

   return $this;
}

This is breaking when we want to access the property via a form :

[NoSuchPropertyException]
HTTP 500 Internal Server Error
The method "isInternational" in class "App\Entity\Conference" requires 0 arguments, but should accept only 1.. Make the property public, add a setter, or set the "mapped" field option in the form type to be false.

This PR revert this change introduce in PR 1493 to keep the 'is' prefix on the setter.

example :

public function setIsInternational(bool $isInternational): static 
{
    $this->isInternational = $isInternational;

    return $this;
}

[nicolas-grekas]

My bad for #1493 (review)

[kbond]

Thank you @octoseth.