Hennadii Stepanov 05c36d9fad Merge bitcoin-core/gui#957: fix: add .dat file extension automatically when exporting watchonly
75a4e6c678 gui: fix allow restore wallets without .dat file extension (Pol Espinasa)
6ed7e05e20 gui: fix add .dat file extension automatically when exporting watchonly (Pol Espinasa)

Pull request description:

  fixes https://github.com/bitcoin-core/gui/issues/956

  Unlike `backup wallet`, `export watch-only wallet` was not automatically adding the file extension to the exported file, making restoring difficult if the user doesn't manually add the file extension after exporting.

  Allows also to restore a wallet from a non specified `.dat` file extension. This is achieved by removing the filter in the select file screen, matching the RPC behavior.

ACKs for top commit:
  hebasto:
    ACK 75a4e6c678.

Tree-SHA512: 7c45d51205f9abf2b67233e8abd3297e49a4230eb32aa4118b37ab9da0a8d692aae4b67a8880881e5fab42256d1cf52ccf1b289b8f23f85930354130c192b33d
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Bitcoin Core integration/staging tree

https://bitcoincore.org

For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.

What is Bitcoin Core?

Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.

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