[Php80] Skip non-zero strpos() offset in StrContainsRector (#8640)

Author: guillaume-sainthillier

rules-tests/Php80/Rector/NotIdentical/StrContainsRector/Fixture/offset_equal_strpos.php.inc

@@ -21,7 +21,7 @@ class OffsetVariableZeroStrpos
     public function run()
     {
         $offset = 0;
-        $isMatch = str_contains(substr('abc', $offset), 'a');
+        $isMatch = str_contains('abc', 'a');
     }
 }
 ?>

rules-tests/Php80/Rector/NotIdentical/StrContainsRector/Fixture/offset_expression_equal_strpos.php.inc

@@ -21,7 +21,7 @@ class OffsetVariableZeroStrpos
     public function run()
     {
         $offset = 0;
-        $isMatch = str_contains(substr('abc', $offset), 'a');
+        $isMatch = str_contains('abc', 'a');
     }
 }
 ?>