Update default repeat_delay to improve holding delete and vim motions

In my testing, this is the lowest you can go without causing any issues
with double key presses.

config/hypr/input.conf

@@ -11,7 +11,7 @@ input {
 
   # Change speed of keyboard repeat
   repeat_rate = 40
-  repeat_delay = 600
+  repeat_delay = 250
 
   # Start with numlock on by default
   numlock_by_default = true