Change default input format for credit card expiration month to NN

[larssandergreen]

Just for new installs.

Before

Have to think.

After

Don't have to think. More standard, reflects what it actually says on your card.

Comments

It would be nice to also show the same format on the review and thank you pages for contribution and events, but crmDate doesn't support Date Preferences formats, only Date Formats, so that's a future project.

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[yashodha]

@larssandergreen looks good, merging this PR

[larssandergreen]

@yashodha Thanks!

[mlutfy]

I just saw this and I'm really happy :D