[Thread Tutorial] Update type for temperature

Author: tyler-potyondy

examples/tutorials/thread_network/08_screen_u8g2/main.c

@@ -16,7 +16,7 @@ static void update_screen(void);
 
 uint8_t global_temperature_setpoint = 0;
 uint8_t local_temperature_setpoint  = 22;
-uint8_t measured_temperature        = 0;
+int measured_temperature = 0;
 
 static void button_callback(returncode_t ret,
                             int          btn_num,

examples/tutorials/thread_network/09_screen_final/main.c

@@ -16,7 +16,7 @@ static void update_screen(void);
 
 uint8_t global_temperature_setpoint = 0;
 uint8_t local_temperature_setpoint  = 22;
-uint8_t measured_temperature        = 0;
+int measured_temperature = 0;
 
 bool callback_event = false;
 

examples/tutorials/thread_network/10_screen_ipc/main.c

@@ -19,7 +19,7 @@ static void update_screen(void);
 
 uint8_t global_temperature_setpoint = 0;
 uint8_t local_temperature_setpoint  = 22;
-uint8_t measured_temperature        = 0;
+int measured_temperature = 0;
 
 uint8_t prior_global_temperature_setpoint = 255;
 uint8_t prior_local_temperature_setpoint  = 255;