use explicit order for insert operations

This prevents a problem from different column orders in database tables.
In particular, this occurred with the user_packets table, where the `rank` column moved up in order.

OpenKeychain/src/main/sqldelight/org/sufficientlysecure/keychain/KeySignatures.sq

@@ -6,7 +6,7 @@ CREATE TABLE IF NOT EXISTS key_signatures (
 );
 
 insertKeySignature:
-INSERT INTO key_signatures VALUES (?, ?);
+INSERT INTO key_signatures (master_key_id, signer_key_id) VALUES (?, ?);
 
 selectMasterKeyIdsBySigner:
 SELECT master_key_id