Allow field names as rule options

Change-Id: Ife4f15a09818cf6daf86b96e7c916854d0299be8
diff --git a/cmd/koralmapper/main.go b/cmd/koralmapper/main.go
index 9b9b95d..3a2b318 100644
--- a/cmd/koralmapper/main.go
+++ b/cmd/koralmapper/main.go
@@ -448,6 +448,8 @@
 				LayerA:    entry.LayerA,
 				FoundryB:  entry.FoundryB,
 				LayerB:    entry.LayerB,
+				FieldA:    entry.FieldA,
+				FieldB:    entry.FieldB,
 			})
 		}
 
@@ -505,6 +507,8 @@
 				LayerA:    entry.LayerA,
 				FoundryB:  entry.FoundryB,
 				LayerB:    entry.LayerB,
+				FieldA:    entry.FieldA,
+				FieldB:    entry.FieldB,
 			})
 		}