Remove a debugging Serial.print()

These two lines went in by mistake earlier, they were meant for local
debugging only. As such, having them in the plugin is a bug, easily
squashed by removing them.

Signed-off-by: Csilla Nagyné Martinák <csilla@csillger.hu>

src/Kaleidoscope/EEPROM-Settings.cpp

@@ -62,9 +62,6 @@ uint16_t EEPROMSettings::requestSlice(uint16_t size) {
   if (sealed_)
     return 0;
 
-  Serial.print("requestSlice; size=");
-  Serial.println(size);
-
   uint16_t start = next_start_;
   next_start_ += size;