In PDA mode pressing spa heat enables spa mode instead

[ballle98]

see ballle98/AqualinkD#53

request for button "spa_heater" was matching button label "spa" because the sting comparison was only going to the length of the label. Strings need to match in length and in content. This is similar to an older PDA issue ballle98/AqualinkD#1

11:10:24.507 Debug:   NetService:WS: Message - Key 'command' Value 'Spa_Heater'
11:10:24.509 Debug:   NetService:WS: Message - Key 'uri' Value 'Spa_Heater/set'
11:10:24.512 Debug:   NetService:WS: Message - Key 'value' Value '1'
11:10:24.513 Debug:   NetService:WS: URI Request 'Spa_Heater/set': value 1.00
11:10:24.514 Info:    NetService:WS: received 'ON' for 'Spa_Mode', turning 'ON'
11:10:24.518 Debug:   Panl Prog: Thread 13,0xb5401f90 is active (Switch PDA device on/off)