Fix M503 output for M145

Fixes #7978

Marlin/src/module/configuration_store.cpp

         CONFIG_ECHO_START;
         SERIAL_ECHOLNPGM("Material heatup parameters:");
       }
-      CONFIG_ECHO_START;
       for (uint8_t i = 0; i < COUNT(lcd_preheat_hotend_temp); i++) {
+        CONFIG_ECHO_START;
         SERIAL_ECHOPAIR("  M145 S", (int)i);
         SERIAL_ECHOPAIR(" H", TEMP_UNIT(lcd_preheat_hotend_temp[i]));
         SERIAL_ECHOPAIR(" B", TEMP_UNIT(lcd_preheat_bed_temp[i]));