Remove redundant KC_TRNS and KC_NO fillers in remaining keymaps (#5154)

keyboards/planck/keymaps/basic/keymap.c

@@ -6,10 +6,6 @@
 // Layer names don't all need to be of the same length, obviously, and you can also skip them
 // entirely and just use numbers.
 
-// Fillers to make layering more clear
-#define _______ KC_TRNS
-#define XXXXXXX KC_NO
-
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 
 /* Qwerty