Change isRemoval to only check for minOccurs=0

Author: AndreasA

src/AbstractElementHandler.php

@@ -169,6 +169,6 @@ public function isRequired(): bool
 
     public function isRemovable(): bool
     {
-        return $this->isOptional() && $this->getNillable();
+        return $this->isOptional();
     }
 }

tests/ElementHandlerTest.php

@@ -242,7 +242,7 @@ public function testYandexIsRemovableFalse(): void
             'name' => 'TrackingParams',
         ]);
 
-        $this->assertFalse($element->isRemovable());
+        $this->assertTrue($element->isRemovable());
     }
 
     public function testActonGetNillableFalse(): void