Apply #pragma once, misc cleanup (#12322)

* Apply #pragma once in headers
* Adjust some thermistors formatting
* Misc cleanup and formatting

Marlin/src/sd/SdFatConfig.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * SdFatConfig.h
@@ -28,12 +29,8 @@
  * This file is part of the Arduino Sd2Card Library
  */
 
-#ifndef _SDFATCONFIG_H_
-#define _SDFATCONFIG_H_
-
 #include "../inc/MarlinConfig.h"
 
-
 /**
  * To use multiple SD cards set USE_MULTIPLE_CARDS nonzero.
  *
@@ -113,5 +110,3 @@
 
 // Total bytes needed to store a single long filename
 #define LONG_FILENAME_LENGTH (FILENAME_LENGTH * MAX_VFAT_ENTRIES + 1)
-
-#endif // _SDFATCONFIG_H_