Fix Param::isPublic() for param with asymmetric visibility

Fixes #1096.

Author: nikic

lib/PhpParser/Node/Param.php

@@ -77,7 +77,7 @@ public function isPublic(): bool {
             return true;
         }
 
-        if ($this->hooks === []) {
+        if (!$this->isPromoted()) {
             return false;
         }
 

test/PhpParser/Node/ParamTest.php

@@ -42,10 +42,13 @@ public function testSetVisibility() {
         $node = new Param(new Variable('foo'));
         $node->flags = Modifiers::PRIVATE_SET;
         $this->assertTrue($node->isPrivateSet());
+        $this->assertTrue($node->isPublic());
         $node->flags = Modifiers::PROTECTED_SET;
         $this->assertTrue($node->isProtectedSet());
+        $this->assertTrue($node->isPublic());
         $node->flags = Modifiers::PUBLIC_SET;
         $this->assertTrue($node->isPublicSet());
+        $this->assertTrue($node->isPublic());
     }
 
     public function testPromotedPropertyWithoutVisibilityModifier(): void {