Fix out-of-bound array access in T1000X Sensor (#4663)

if u8i == 135, then u8i++ runs, the loop exits since u8i == 136,
then value for u8i is 136 after the for loop.

then in the next line, ntc_res2[u8i] will read past the end
 of the array

src/modules/Telemetry/Sensor/T1000xSensor.cpp

@@ -95,7 +95,7 @@ float T1000xSensor::getTemp()
 
     Vout = ntc_vot;
     Rt = (HEATER_NTC_RP * vcc_vot) / Vout - HEATER_NTC_RP;
-    for (u8i = 0; u8i < 136; u8i++) {
+    for (u8i = 0; u8i < 135; u8i++) {
         if (Rt >= ntc_res2[u8i]) {
             break;
         }