osc: compromise on default deadzonesize

This way people can still use the mouse to quickly check the elapsed time
without moving it all the way to the bottom while still having half the screen
to ignore mouse movement.

DOCS/man/osc.rst

@@ -158,7 +158,7 @@ Configurable Options
       Default pre-0.21.0 was 'slider'.
 
 ``deadzonesize``
-    | Default: 1.0
+    | Default: 0.5
     | Size of the deadzone. The deadzone is an area that makes the mouse act
       like leaving the window. Movement there won't make the OSC show up and
       it will hide immediately if the mouse enters it. The deadzone starts

player/lua/osc.lua

@@ -25,7 +25,7 @@ local user_opts = {
                                 -- mouse movement. enforced non-negative for the
                                 -- user, but internally negative is "always-on".
     fadeduration = 200,         -- duration of fade out in ms, 0 = no fade
-    deadzonesize = 1,           -- size of deadzone
+    deadzonesize = 0.5,         -- size of deadzone
     minmousemove = 0,           -- minimum amount of pixels the mouse has to
                                 -- move between ticks to make the OSC show up
     iamaprogrammer = false,     -- use native mpv values and disable OSC