osc: remove trailing space

Fixes: b80e4e46a3

player/lua/osc.lua

@@ -1878,7 +1878,7 @@ function osc_init()
 
     ne.content = function ()
         if mp.get_property("pause") == "yes" then
-            if mp.get_property("play-direction", "forward") ~= "backward" then 
+            if mp.get_property("play-direction", "forward") ~= "backward" then
                 return ("\238\132\129")
             else
                 return ("\238\132\144")