[DowngradePhp80] Handle combine DowngradeMixedTypeDeclarationRector+DowngradeAttributeToAnnotationRector on declare(strict_types=1) inline after open php tag

[samsonasik]

Fixes rectorphp/rector#9759

It cause added new line before inline <?php declare(strict_types=1); just after open tag:

Failed asserting that string matches format description.
--- Expected
+++ Actual
@@ @@
+
 <?php declare(strict_types=1);

[samsonasik]

Fixed 🎉 /cc @TomasVotruba

[samsonasik]

All green 🎉 let's merge to have faster feedback to test ;)

[TomasVotruba]

👍