include credPairRemoteFields in RemoteConfigParsers

Avoids parse error when the fields are added to RemoteConfig at setup
time and it then gets parsed, also at setup time. After setup time, such
internally added fields are not a problem, because they're Accepted. So
it may not be necessary in all cases to list such internally added
fields, but I think it's a good idea to always do so.

Remote/Helper/AWS.hs

@@ -13,6 +13,7 @@ module Remote.Helper.AWS where
 import Annex.Common
 import Creds
 import Types.ProposedAccepted
+import Types.RemoteConfig
 
 import qualified Data.Map as M
 import qualified Data.ByteString as B
@@ -24,9 +25,12 @@ creds :: UUID -> CredPairStorage
 creds u = CredPairStorage
 	{ credPairFile = fromUUID u
 	, credPairEnvironment = ("AWS_ACCESS_KEY_ID", "AWS_SECRET_ACCESS_KEY")
-	, credPairRemoteField = Accepted "s3creds"
+	, credPairRemoteField = s3credsField
 	}
 
+s3credsField :: RemoteConfigField
+s3credsField = Accepted "s3creds"
+
 data Service = S3 | Glacier
 	deriving (Eq)