More conservative Trinamic DIR delay

See #17323

This makes babystepping more reliable and may improve Trinamic motion overall.

Co-Authored-By: chgi <chgi@users.noreply.github.com>

Marlin/src/inc/Conditionals_adv.h

 #endif
 
 /**
- * Driver Timings
+ * Driver Timings (in nanoseconds)
  * NOTE: Driver timing order is longest-to-shortest duration.
  *       Preserve this ordering when adding new drivers.
  */
-
 #ifndef MINIMUM_STEPPER_POST_DIR_DELAY
   #if HAS_DRIVER(TB6560)
     #define MINIMUM_STEPPER_POST_DIR_DELAY 15000
   #elif HAS_DRIVER(A4988)
     #define MINIMUM_STEPPER_POST_DIR_DELAY 200
   #elif HAS_TRINAMIC_CONFIG || HAS_TRINAMIC_STANDALONE
-    #define MINIMUM_STEPPER_POST_DIR_DELAY 20
+    #define MINIMUM_STEPPER_POST_DIR_DELAY 60
   #else
     #define MINIMUM_STEPPER_POST_DIR_DELAY 0   // Expect at least 10µS since one Stepper ISR must transpire
   #endif