ZF-11484: setting enableHeaderCheck doesn't read the file type passed by the browser

Description

If fileinfo is NOT enabled and enableHeaderCheck is set to true on the isImage validator the "type" in the $_FILES array is NOT used. Things go wrong because in Zend_File_Transfer_Adapter_Abstract the _detectMimeType function defaults to "application/octet-stream" if fileinfo isn't found which is used to set the type in the adapters internal files hash. Maybe the validator should use the $_FILES array directly or the _dectectMimeType should consider the headerCheck flag and fall back on using the "type" key.

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