GRIF-312: Fixing missing checking condition for Snowflake key pair authentication

Author: hung-nguyen-hoang

lib/gooddata/cloud_resources/snowflake/snowflake_client.rb

@@ -130,7 +130,7 @@ def build_private_key(private_key_string, pass_phrase)
             builder = JceOpenSSLPKCS8DecryptorProviderBuilder.new
             decryptor = builder.build(pass_phrase.to_java.to_char_array)
             private_key_info = pem_object.decryptPrivateKeyInfo(decryptor)
-          else pem_object.is_a?(PrivateKeyInfo)
+          elsif pem_object.is_a?(PrivateKeyInfo)
             private_key_info = pem_object
           end