Change default box_position_v to 0.5

This can potentially be confusing to users.

Signed-off-by: AnErrupTion <anerruption@disroot.org>

res/config.ini

@@ -104,8 +104,8 @@ border_fg = 0x00FFFFFF
 box_position_h = 0.5
 
 # Relative vertical position from the bottom of the screen
-# default: 0.4
-box_position_v = 0.4
+# default: 0.5
+box_position_v = 0.5
 
 # Title to show at the top of the main box
 # If set to null, none will be shown