tablet: pass motion events to implicitly grabbed surface

Refs swaywm/sway#5302.

types/tablet_v2/wlr_tablet_v2_tool.c

@@ -792,18 +792,6 @@ static void implicit_tool_up(struct wlr_tablet_tool_v2_grab *grab) {
 	check_and_release_implicit_grab(grab);
 }
 
-/* Only send the motion event, when we are over the surface for now */
-static void implicit_tool_motion(
-	struct wlr_tablet_tool_v2_grab *grab, double x, double y) {
-	struct implicit_grab_state *state = grab->data;
-	if (state->focused != state->original) {
-		return;
-	}
-
-	wlr_send_tablet_v2_tablet_tool_motion(grab->tool, x, y);
-}
-
-
 static void implicit_tool_button(
 	struct wlr_tablet_tool_v2_grab *grab, uint32_t button,
 	enum zwp_tablet_pad_v2_button_state state) {
@@ -822,7 +810,7 @@ static const struct wlr_tablet_tool_v2_grab_interface
 	.proximity_in = implicit_tool_proximity_in,
 	.down = implicit_tool_down,
 	.up = implicit_tool_up,
-	.motion = implicit_tool_motion,
+	.motion = default_tool_motion,
 	.pressure = default_tool_pressure,
 	.distance = default_tool_distance,
 	.tilt = default_tool_tilt,