[TypeDeclarationDocblocks] Skip first class callable on AddReturnDocblockForJsonArrayRector

[samsonasik]

Avoid error:

There was 1 failure:

1) Rector\Tests\TypeDeclarationDocblocks\Rector\ClassMethod\AddReturnDocblockForJsonArrayRector\AddReturnDocblockForJsonArrayRectorTest::test with data set #2 ('/Users/samsonasik/www/rector-...hp.inc')
assert(!$this->isFirstClassCallable())

/Users/samsonasik/www/rector-src/vendor/nikic/php-parser/lib/PhpParser/Node/Expr/CallLike.php:32
/Users/samsonasik/www/rector-src/rules/TypeDeclarationDocblocks/Rector/ClassMethod/AddReturnDocblockForJsonArrayRector.php:138

[samsonasik]

Fixed 🎉 /cc @TomasVotruba

[samsonasik]

All checks have passed 🎉 @TomasVotruba I am merging it ;)

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