[fix] Add fake delayed pan to SDL scroll event (#4758)

Not actually delayed. Avoids a crash otherwise caused by #4666.

frontend/device/sdl/device.lua

@@ -101,20 +101,24 @@ function Device:init()
                     local fake_ges = {
                         ges = "pan",
                         distance = 200,
+                        distance_delayed = 200,
                         relative = {
                             x = 50*scrolled_x,
                             y = 100*scrolled_y,
                         },
+                        relative_delayed = {
+                            x = 50*scrolled_x,
+                            y = 100*scrolled_y,
+                        },
                         pos = pos,
                         time = timev,
                     }
                     local fake_ges_release = {
                         ges = "pan_release",
-                        distance = 200,
-                        relative = {
-                            x = 50*scrolled_x,
-                            y = 100*scrolled_y,
-                        },
+                        distance = fake_ges.distance,
+                        distance_delayed = fake_ges.distance_delayed,
+                        relative = fake_ges.relative,
+                        relative_delayed = fake_ges.relative_delayed,
                         pos = pos,
                         time = timev,
                     }