Strip out shared_script_properties support

Due to the raised mpv version requirement of 0.39,
shared_script_properties don't exist anymore.

quality-menu.lua

@@ -659,43 +659,20 @@ local function text_menu_open(formats, active_format, menu_type)
         draw_menu()
     end
 
-    local update_margins;
-    if utils.shared_script_property_set then
-        update_margins = function()
-            local shared_props = mp.get_property_native('shared-script-properties')
-            local val = shared_props['osc-margins']
-            if val then
-                -- formatted as '%f,%f,%f,%f' with left, right, top, bottom, each
-                -- value being the border size as ratio of the window size (0.0-1.0)
-                local vals = {}
-                for v in string.gmatch(val, '[^,]+') do
-                    vals[#vals + 1] = tonumber(v)
-                end
-                margin_top = vals[3] -- top
-                margin_bottom = vals[4] -- bottom
-            else
-                margin_top = 0
-                margin_bottom = 0
-            end
-            draw_menu()
+    local update_margins = function(_, val)
+        if not val then
+            val = mp.get_property_native('user-data/osc/margins')
         end
-        mp.observe_property('shared-script-properties', 'native', update_margins)
-    else
-        update_margins = function(_, val)
-            if not val then
-                val = mp.get_property_native('user-data/osc/margins')
-            end
-            if val then
-                margin_top = val.t
-                margin_bottom = val.b
-            else
-                margin_top = 0
-                margin_bottom = 0
-            end
-            draw_menu()
+        if val then
+            margin_top = val.t
+            margin_bottom = val.b
+        else
+            margin_top = 0
+            margin_bottom = 0
         end
-        mp.observe_property('user-data/osc/margins', 'native', update_margins)
+        draw_menu()
     end
+    mp.observe_property('user-data/osc/margins', 'native', update_margins)
 
     update_dimensions()
     update_margins()