Update FlashMessenger.php

Hello, the feature of rendering is fantastic, but you can not print the current message, this second method would make this work.
Adjusting as requests ;)
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Merge pull request #5759 from diegobittencourt/patch-1

Update FlashMessenger.php

Conflicts:
	library/Zend/View/Helper/FlashMessenger.php
[#5759] Added changelog note
Merge branch 'feature/5759' into develop

Close #5759