Fixed behaviour in the falling phase PJ03 StarterKit

According to #2585 there was a "glitch" in the falling phase because of a
missing +2 in the first condition

Author: agdl

Diff for: build/shared/examples/10.StarterKit/p03_LoveOMeter/p03_LoveOMeter.ino

@@ -60,7 +60,7 @@ void loop() {
 
   // if the current temperature is lower than the baseline
   // turn off all LEDs
-  if (temperature < baselineTemp) {
+  if (temperature < baselineTemp + 2) {
     digitalWrite(2, LOW);
     digitalWrite(3, LOW);
     digitalWrite(4, LOW);