Show '*' for zero 'stst' flag

Marlin/src/feature/tmc_util.cpp

@@ -723,7 +723,7 @@
     SERIAL_CHAR('\t');
     switch (i) {
       case TMC_DRV_CODES:     st.printLabel();  break;
-      case TMC_STST:          if (st.stst())         SERIAL_CHAR('*'); break;
+      case TMC_STST:          if (!st.stst())   SERIAL_CHAR('*'); break;
       case TMC_OLB:           if (st.olb())     SERIAL_CHAR('*'); break;
       case TMC_OLA:           if (st.ola())     SERIAL_CHAR('*'); break;
       case TMC_S2GB:          if (st.s2gb())    SERIAL_CHAR('*'); break;