Set currency template variable from contribution pages

[eileenmcnaughton]

Overview

Assign $currency variable to the template for contribution pages more consistently

Before

Under some circumstances the smarty var currencyID is not populated

After

variable is more consistenty populated

Technical Details

When we load the PaymentForm the currency is set there and assigned to the template.

However, if the form doesn't load by default (ie because there is no payment processor selected by
default) the currency variable is not assigned to the template.

When the payment form is loaded by
var dataUrl = '{crmURL p='civicrm/payment/form' h=0 q=formName=

Comments

[civibot]

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[mattwire]

Confirmed that without this PR currency is not always assigned to the form on a contribution page. With this PR it is! Ok to merge.