Fix bottom panel being unintentionally draggable

Author: syntaxerror247

editor/editor_node.cpp

@@ -7931,7 +7931,7 @@ EditorNode::EditorNode() {
 	center_split->set_name("DockVSplitCenter");
 	center_split->set_vertical(true);
 	center_split->set_v_size_flags(Control::SIZE_EXPAND_FILL);
-	center_split->set_collapsed(false);
+	center_split->set_collapsed(true);
 	center_vb->add_child(center_split);
 
 	right_hsplit = memnew(DockSplitContainer);