fix supported-payment-methods data format

[Sharqiewicz]

Refactored supported-payment-methods endpoint data format.

Before:

paymentMethods: [
      { id: 'sepa', name: 'SEPA', supportedFiats: ['eur'], limits: { min: 10, max: 50000 } },
      { id: 'pix', name: 'PIX', supportedFiats: ['brl'], limits: { min: 1, max: 500000 } },
      { id: 'cbu', name: 'CBU', supportedFiats: ['ars'], limits: { min: 1, max: 500000 } },
    ]

After:

paymentMethods: [
  { id: 'sepa', name: 'SEPA', supportedFiats: [{
  	id: 'eur',
    name: 'EURO',
    limits: { min: 10, max: 50000 }
  }]
  },
  { id: 'pix', name: 'PIX', supportedFiats: [{
  	id: 'brl',
    name: 'Brazilian Real',
    limits: { min: 1, max: 500000 }
  }]
  },
  { id: 'cbu', name: 'CBU', supportedFiats: [{
    id: 'ars',
    name: 'Argentine Peso',
    limits: { min: 1, max: 500000 }
  }]
  },
]

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