Updated default MRR currency from settings
Updated default MRR currency from settings

closes https://github.com/TryGhost/Team/issues/550

The MRR chart relied on first currency from the list in case of data for multiple currencies, falling back to USD in case of no MRR data for the site. This can be misleading, specially when the active currency set in payment settings is different from one picked to show on MRR chart.

The change updates dashboard to always pick the currency from Payment settings as default for showing chart data.

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