osc.lua: hide osc or wc when leaving its area

Those zones use input sections, but in OSC we allow them to overlap. So,
we might switch to the other section, after which point we won't get
mouse_leave event that would hide the bar for the other section.

This makes hidding/showing WC and OSC more consistent.

Author: kasper93

player/lua/osc.lua

@@ -2413,8 +2413,8 @@ local function process_event(source, what)
                 )
             ) then
             if window_controls_enabled() and user_opts.windowcontrols_independent then
-                if mouse_in_area("showhide_wc") then show_wc() end
-                if mouse_in_area("showhide") then show_osc() end
+                if mouse_in_area("showhide_wc") then show_wc() else hide_wc() end
+                if mouse_in_area("showhide") then show_osc() else hide_osc() end
             else
                 show_osc()
                 if window_controls_enabled() then show_wc() end