Add Getter methods to BatteryMatchWrapper (GregTechCEu#2903)

Author: mrquentin

src/main/java/com/gregtechceu/gtceu/common/machine/multiblock/electric/PowerSubstationMachine.java

@@ -566,6 +566,7 @@ public ManagedFieldHolder getFieldHolder() {
         }
     }
 
+    @Getter
     public static class BatteryMatchWrapper {
 
         private final IBatteryData partType;