Fix tests and remove redundant import

Author: iNem0o

rules-tests/DowngradePhp80/Rector/Expression/DowngradeThrowExprRector/Fixture/no_isset_on_expr.php.inc

@@ -20,7 +20,7 @@ final class NoIssetOnExpr
 {
     public function run($backedEnumClassName, $backedEnumValue)
     {
-        if ($backedEnumClassName::tryFrom($backedEnumValue) !== null) {
+        if ($backedEnumClassName::tryFrom($backedEnumValue) === null) {
             throw new \Symfony\Component\DependencyInjection\Exception\RuntimeException(sprintf('Enum value "%s" is not backed by "%s".', $backedEnumValue, $backedEnumClassName));
         }
         return $backedEnumClassName::tryFrom($backedEnumValue);

rules/DowngradePhp80/Rector/Expression/DowngradeThrowExprRector.php

@@ -11,7 +11,6 @@
 use PhpParser\Node\Expr\Assign;
 use PhpParser\Node\Expr\BinaryOp\Coalesce;
 use PhpParser\Node\Expr\BinaryOp\Identical;
-use PhpParser\Node\Expr\BinaryOp\Identical;
 use PhpParser\Node\Expr\BooleanNot;
 use PhpParser\Node\Expr\Closure;
 use PhpParser\Node\Expr\ConstFetch;