Add PRIMARY KEY to tmp_keys for sanity checking

Signed-off-by: Graham <gpe@openrs2.org>

archive/src/main/kotlin/org/openrs2/archive/key/KeyImporter.kt

@@ -105,7 +105,7 @@ public class KeyImporter @Inject constructor(
         connection.prepareStatement(
             """
             CREATE TEMPORARY TABLE tmp_keys (
-                key xtea_key NOT NULL
+                key xtea_key PRIMARY KEY NOT NULL
             ) ON COMMIT DROP
         """.trimIndent()
         ).use { stmt ->