TMC SGT is int8 (#9651)

Marlin/src/feature/tmc_util.cpp

@@ -236,7 +236,7 @@ void _tmc_say_pwmthrs(const char name[], const uint32_t thrs) {
   SERIAL_ECHO(name);
   SERIAL_ECHOLNPAIR(" stealthChop max speed set to ", thrs);
 }
-void _tmc_say_sgt(const char name[], const uint32_t sgt) {
+void _tmc_say_sgt(const char name[], const int8_t sgt) {
   SERIAL_ECHO(name);
   SERIAL_ECHOPGM(" driver homing sensitivity set to ");
   SERIAL_PRINTLN(sgt, DEC);

Marlin/src/feature/tmc_util.h

@@ -43,7 +43,7 @@ void _tmc_say_current(const char name[], const uint16_t curr);
 void _tmc_say_otpw(const char name[], const bool otpw);
 void _tmc_say_otpw_cleared(const char name[]);
 void _tmc_say_pwmthrs(const char name[], const uint32_t thrs);
-void _tmc_say_sgt(const char name[], const uint32_t sgt);
+void _tmc_say_sgt(const char name[], const int8_t sgt);
 
 template<typename TMC>
 void tmc_get_current(TMC &st, const char name[]) {