Do not clear last print fail stats prematurely

M24 was always cleaning the last print failstats. But because M24 is
used to restore a print after power failure (by setting the seek
offset), it would also reset the stats incorrectly after resuming.

Check for the file index position and reset the stats only when a print
is started from the beginning of the file.

Apply the same logic to M32 and similarly handle the LA10->15 conversion
(do not re-apply the adjustment for a resumed print).

Firmware/Marlin_main.cpp

@@ -5576,10 +5576,15 @@ if(eSoundMode!=e_SOUND_MODE_SILENT)
           lcd_resume_print();
       else
       {
-          failstats_reset_print();
+          if (!card.get_sdpos())
+          {
+              // A new print has started from scratch, reset stats
+              failstats_reset_print();
 #ifndef LA_NOCOMPAT
-          la10c_reset();
+              la10c_reset();
 #endif
+          }
+
           card.startFileprint();
           starttime=_millis();
       }
@@ -5689,12 +5694,19 @@ if(eSoundMode!=e_SOUND_MODE_SILENT)
         if(code_seen('S'))
           if(strchr_pointer<namestartpos) //only if "S" is occuring _before_ the filename
             card.setIndex(code_value_long());
-#ifndef LA_NOCOMPAT
-        la10c_reset();
-#endif
         card.startFileprint();
         if(!call_procedure)
-          starttime=_millis(); //procedure calls count as normal print time.
+        {
+            if(!card.get_sdpos())
+            {
+                // A new print has started from scratch, reset stats
+                failstats_reset_print();
+#ifndef LA_NOCOMPAT
+                la10c_reset();
+#endif
+            }
+            starttime=_millis(); // procedure calls count as normal print time.
+        }
       }
     } break;