SFT-3618: Replace trezorcrypto.secp256k1.publickey.

* ports/stm32/boards/Passport/modules/tasks/nostr_key_task.py
(nostr_key_task): Use secp256k1.public_key_schnorr instead of
nostr_pubkey_from_pk.
* ports/stm32/boards/Passport/modules/utils.py
(nostr_pubkey_from_pk): Remove function.

ports/stm32/boards/Passport/modules/tasks/nostr_key_task.py

@@ -6,13 +6,14 @@
 
 async def nostr_key_task(on_done, index):
     import stash
-    from utils import nostr_pubkey_from_pk, nostr_nip19_from_key
+    from foundation import secp256k1
+    from utils import nostr_nip19_from_key
 
     path = "m/44'/1237'/{}'/0/0".format(index)
     with stash.SensitiveValues() as sv:
         node = sv.derive_path(path)
         key = node.private_key()
-    pub = nostr_pubkey_from_pk(key)
+    pub = secp256k1.public_key_schnorr(key)
     nsec = nostr_nip19_from_key(key, "nsec")
     npub = nostr_nip19_from_key(pub, "npub")
     await on_done({'priv': nsec, 'npub': npub, 'pk': key, 'pub': pub}, None)

ports/stm32/boards/Passport/modules/utils.py

@@ -1360,12 +1360,6 @@ def get_seed_from_words(words):
     entropy = entropy[:trim_pos]  # Trim off the excess (including checksum bits)
     return entropy
 
-
-def nostr_pubkey_from_pk(pk):
-    from trezorcrypto import secp256k1
-    return secp256k1.publickey(pk, True)[1:]
-
-
 def nostr_nip19_from_key(key, key_type):  # generate nsec/npub
     import tcc
     return tcc.codecs.bech32_plain_encode(key_type, key)