[bisq-network/bisq] Use BitcoinAverage global (#3829)

[nokswedkk]

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Fixes #3527 

With global price data we get overall better price dynamics with respect to low volume currency markets which occasionally were reported as meaningless to trade on. The change has inconsiderable effect on high volume currency markets with a resulting discrepancy in price of  0 mean and 0.001x standard deviation as measured.

You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/3829

-- Commit Summary --

  * Give global data precedence
  * Timestamp global

-- File Changes --

    M pricenode/src/main/java/bisq/price/spot/ExchangeRateService.java (2)
    M pricenode/src/main/java/bisq/price/spot/providers/BitcoinAverage.java (16)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/3829.patch
https://github.com/bisq-network/bisq/pull/3829.diff

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