thermostat mqtt is now json. removed 'low' setting in thermostat mode

src/ems.h

@@ -149,7 +149,7 @@ typedef struct {
 typedef struct {
     float   setpoint_roomTemp; // current set temp
     float   curr_roomTemp;     // current room temp
-    uint8_t mode;              // 0=low, 1=manual, 2=clock/auto
+    uint8_t mode;              // 0=low, 1=manual, 2=auto
     uint8_t hour;
     uint8_t minute;
     uint8_t second;