Increment MATRIX_IO_DELAY to 4

According to marfrit's testing: (Thank You!)
MATRIX_IO_DELAY =  1 results in space spamming the letter "M"
MATRIX_IO_DELAY =  2 only emits one m on short press instead of 5
MATRIX_IO_DELAY =  3 seems to mitigate that completely

For safety I'm increasing this to 4.

keyboards/unicomp/mini_m/minirazz/config.h

@@ -26,4 +26,4 @@
 #define WEAR_LEVELING_LOGICAL_SIZE 16384
 #define WEAR_LEVELING_BACKING_SIZE (WEAR_LEVELING_LOGICAL_SIZE * 2)
 
-#define MATRIX_IO_DELAY 1
+#define MATRIX_IO_DELAY 4