Rename variable in getEmbedNode function

lib/src/utils/embeds.dart

@@ -7,13 +7,13 @@ import '../widgets/controller.dart';
 
 Tuple2<int, Embed> getEmbedNode(QuillController controller, int offset) {
   var offset = controller.selection.start;
-  var imageNode = controller.queryNode(offset);
-  if (imageNode == null || !(imageNode is Embed)) {
+  var embedNode = controller.queryNode(offset);
+  if (embedNode == null || !(embedNode is Embed)) {
     offset = max(0, offset - 1);
-    imageNode = controller.queryNode(offset);
+    embedNode = controller.queryNode(offset);
   }
-  if (imageNode != null && imageNode is Embed) {
-    return Tuple2(offset, imageNode);
+  if (embedNode != null && embedNode is Embed) {
+    return Tuple2(offset, embedNode);
   }
 
   return throw 'Embed node not found by offset $offset';