Update import name in keys.go

The import name for the package "github.com/Hubmakerlabs/replicatr/pkg/ec" in keys.go was updated. This change has removed the preceding "btcec" alias for consistency and simplicity across the code.

pkg/nostr/nip19/keys.go

@@ -3,7 +3,7 @@ package nip19
 import (
  "fmt"
 
- btcec "github.com/Hubmakerlabs/replicatr/pkg/ec"
+ "github.com/Hubmakerlabs/replicatr/pkg/ec"
  "github.com/Hubmakerlabs/replicatr/pkg/hex"
  log2 "github.com/Hubmakerlabs/replicatr/pkg/log"