Remove interface declaration

Signed-off-by: Denis Kopylov <[email protected]>

Author: Den4ik

dev/tests/static/framework/Magento/CodeMessDetector/Rule/UnusedCode/UnusedFormalParameter.php

@@ -7,7 +7,6 @@
 
 namespace Magento\CodeMessDetector\Rule\UnusedCode;
 
-use Magento\Framework\Interception\PluginInterface;
 use PDepend\Source\AST\ASTParameter;
 use PHPMD\AbstractNode;
 use PHPMD\Node\ClassNode;