Fix added secp256r1 to SigningKeyCreationCfg as well

Signed-off-by: Francis Pouatcha <[email protected]>

datasafe-encryption/datasafe-encryption-api/src/main/java/de/adorsys/datasafe/encrypiton/api/types/encryption/KeyCreationConfig.java

@@ -71,6 +71,6 @@ public static class SigningKeyCreationCfg {
  private final String sigAlgo = "SHA256withECDSA";
 
  @Builder.Default
- private final String curve = "Curve25519";
+ private final String curve = "secp256r1";
  }
 }