Update liveview interpreter to match desktop

packages/liveview/src/interpreter.js

@@ -418,6 +418,8 @@ function serialize_event(event) {
         clientY,
         ctrlKey,
         metaKey,
+        offsetX,
+        offsetY,
         pageX,
         pageY,
         screenX,
@@ -432,6 +434,8 @@ function serialize_event(event) {
         client_y: clientY,
         ctrl_key: ctrlKey,
         meta_key: metaKey,
+        offset_x: offsetX,
+        offset_y: offsetY,
         page_x: pageX,
         page_y: pageY,
         screen_x: screenX,