Changed some usermods to be "disabled" by default

Some usermods may cause unexpected behaviour if not configured properly.
* Battery: can cause unexpected shutdowns if no voltage measurement circuit connected
* RTC: can cause unexpected time &date changes if no RTC connected to I2C
* mcu temp: can cause hight CPU load, and may cause instabilities due to use of an "unsupported" API from espressif

wled00/usermods_list.cpp

@@ -225,7 +225,7 @@ void registerUsermods()
    */
   //usermods.add(new MyExampleUsermod());
 #ifdef USERMOD_BATTERY
-  usermods.add(new UsermodBattery("Battery", true));
+  usermods.add(new UsermodBattery("Battery", false));  // WLEDMM
 #endif
 
 #ifdef USERMOD_DALLASTEMPERATURE
@@ -293,7 +293,7 @@ void registerUsermods()
 #endif
 
 #ifdef USERMOD_RTC
-  usermods.add(new RTCUsermod("RTC", true));
+  usermods.add(new RTCUsermod("RTC", false));  //WLEDMM
 #endif
 
 #ifdef USERMOD_ELEKSTUBE_IPS
@@ -385,7 +385,7 @@ void registerUsermods()
 #endif
 
 #ifdef USERMOD_MCUTEMP
-  usermods.add(new mcuTemp("MCUTemp", true));
+  usermods.add(new mcuTemp("MCUTemp", false));
 #endif
 
 //#ifdef USERMOD_INTERNAL_TEMPERATURE