Apply #pragma once, misc cleanup (#12322)

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

Marlin/src/module/probe.h

@@ -19,14 +19,12 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * probe.h - Move, deploy, enable, etc.
  */
 
-#ifndef PROBE_H
-#define PROBE_H
-
 #include "../inc/MarlinConfig.h"
 
 #if HAS_BED_PROBE
@@ -73,5 +71,3 @@
     set_bltouch_deployed(false);
   }
 #endif
-
-#endif // PROBE_H