Fix LNURL-auth for bolt.fun

Phoenix will now use the compatibility scheme when authenticating with bolf.fun, instead of the regular scheme.

• (phoenix-legacy) : https://github.com/ACINQ/phoenix/compare/android-legacy-v1.4.24...android-legacy-v1.4.25

Verifying signatures

You will need gpg and our release signing key 7A73FE77DE2C4027. Note that you can get it:

• from our website: https://acinq.co/pgp/drouinf.asc
• from github user @sstone, a committer on eclair: https://api.github.com/users/sstone/gpg_keys

To import our signing key:

$ gpg --import drouinf.asc

To verify the release file checksums and signatures:

$ gpg -d SHA256SUMS.asc > SHA256SUMS.stripped
$ sha256sum -c SHA256SUMS.stripped