currencyCode and currencySymbol have the same values, remove the currencySymbol field and obtain correct values from Dict

[maddy-at-work]

Currently,
currencyCode: Variable values - USD
currencySymbol: Variable value - USD instead of $
For most airlines where currencySymbol cannot be captured using farenet, currencyCode is duplicated in that field. Instead of this redundancy if we can remove this field altogether and obtain symbols using the dictionary.

[BigDataKatha]

Table: farenet_001
Type: https://github.com/EveryMundo/emDataStandards/blob/master/types/offer.schema.json
Issue: Remove currencySymbol property under priceSpecification attribute on the offer-level because the symbol usually cannot be captured from the IBE and is currently being populated with the currency Code.

"priceSpecification": {
      "description": "Price Specification",
      "type": "object",
      "properties": {
        "currencyCode": {
          "description": "The currency (in 3-letter ISO 4217 format) of the price.",
          "type": "string",
          "example": "USD"
        },
        "currencySymbol": {
          "description": "Currency symbol",
          "type": "string",
          "example": "$"
        }
      }
    },

@AnahieM @unoriginalbanter @danielsan @neilgoldman @howardem @renecairo @AVivero @yartiles
Please review the above and let us know if you are using the FareNet field currencySymbol or if we can go ahead to remove it. Thank you!