Merge Staff/Members Online Widgets 1.0.2

I ran a modification that did this back on XF1 (pretty sure it was by @Russ) - but it never got ported.. until now! ?

This is original code and uses only the same idea.

Before:
Посмотреть вложение 3117
After:
Посмотреть вложение 3118

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Fixed missing <div> with nerd_widg_mem_merge3 replacement

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Fixed nerd_widg_mem_merge3 replacement - Members heading should show/hide as intended now..

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