SDCard print completion can use "M0"

Marlin/Marlin_main.cpp

@@ -1182,10 +1182,7 @@ inline void get_serial_commands() {
             LCD_MESSAGEPGM(MSG_INFO_COMPLETED_PRINTS);
             set_led_color(0, 255, 0); // Green
             #if HAS_RESUME_CONTINUE
-              KEEPALIVE_STATE(PAUSED_FOR_USER);
+              enqueue_and_echo_commands_P(PSTR("M0")); // end of the queue!
-              wait_for_user = true;
-              while (wait_for_user) idle();
-              KEEPALIVE_STATE(IN_HANDLER);
             #else
               safe_delay(1000);
             #endif

Marlin/cardreader.cpp

@@ -552,7 +552,7 @@ void CardReader::checkautostart(bool force) {
 
   bool found = false;
   while (root.readDir(p, NULL) > 0) {
-    for (int8_t i = 0; i < (int8_t)strlen((char*)p.name); i++) p.name[i] = tolower(p.name[i]);
+    for (int8_t i = (int8_t)strlen((char*)p.name); i--;) p.name[i] = tolower(p.name[i]);
     if (p.name[9] != '~' && strncmp((char*)p.name, autoname, 5) == 0) {
       openAndPrintFile(autoname);
       found = true;