Can not set SPA heater to 104

[ballle98]

There is a bug in setpoint_check() that is limiting the spa heater setpoint to 103

see ballle98/AqualinkD#56

9:27:22.399 Debug:   PDA:       PDA Aqualink daemon in sleep mode
19:27:23.434 Debug:   NetService:WS: Message - Key 'parameter' Value 'Spa_Heater'
19:27:23.434 Debug:   NetService:WS: Message - Key 'value' Value '104'
19:27:23.434 Debug:   NetService:WS: Message - Key 'uri' Value 'Spa_Heater/setpoint/set'
19:27:23.435 Debug:   NetService:WS: URI Request 'Spa_Heater/setpoint/set': value 104.00
19:27:23.435 Warning: Panl Prog: Setpoint of 104 for Spa is outside range, using 103
19:27:23.435 Notice:  NetService:WS: requested setpoint value 104 is invalid, change to 103
19:27:23.469 Debug:   AqualinkD: Actioning delayed request
19:27:23.474 Debug:   Panl Prog: Thread 4,0xb5400f10 is active (Set Spa heater setpoint)
19:27:23.476 Notice:  AqualinkD: Setting spa heater setpoint to 103