fix single write

Builds/main.hex

@@ -0,0 +1,238 @@
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main.c

@@ -85,6 +85,7 @@ void modbusGet(void) {
                 holdingRegisters[2] = bcd;
                 modbusExchangeRegisters(holdingRegisters,0,4);
                 break;
+            case fcPresetSingleRegister:
             case fcPresetMultipleRegisters:
                 modbusExchangeRegisters(holdingRegisters,0,1);
                 update_display();