Fixing the 'max_per_page' issue

[Bastes]

Hey ^^ thanks for fixing randym#42 (comment) ; there remained an issue though, which this patch fixes (at least on my build). Inspired from: thambley/activeadmin-xls#2

Hope you like it ^^

[ybart]

I'm no longer using this fork. However, I'm happy to merge it if it helps.

[Bastes]

Well, now you're mentionning it... which fork are all the people using actually? (since it's apparent the original gem is not maintained anymore)

[ybart]

Unfortunately, it looks like nobody is actively maintaining it.

[Bastes]

I meant, you mentionned you're no longer using this fork ; I supposed it meant you're using another and was curious as to which ^^°

[ybart]

In fact I am now working on an other project and no longer using the gem at all. But I believe my previous company might still use it.

[Bastes]

Oh, well ^^° thanks for your help.